{"id":8025,"date":"2025-12-14T13:05:27","date_gmt":"2025-12-14T13:05:27","guid":{"rendered":"https:\/\/kingdomautocare.com\/?p=8025"},"modified":"2025-12-14T13:06:13","modified_gmt":"2025-12-14T13:06:13","slug":"how-often-should-you-replace-your-cars-spark-plugs-heres-what-experts-say","status":"publish","type":"post","link":"https:\/\/kingdomautocare.com\/how-often-should-you-replace-your-cars-spark-plugs-heres-what-experts-say\/","title":{"rendered":"How Often Should You Replace Your Car\u2019s Spark Plugs? Here\u2019s What Experts Say"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"8025\" class=\"elementor elementor-8025\" data-elementor-post-type=\"post\">\n\t\t\t\t<div data-particle_enable=\"false\" data-particle-mobile-disabled=\"false\" class=\"elementor-element elementor-element-62fa586e e-flex e-con-boxed wpr-particle-no wpr-jarallax-no wpr-parallax-no wpr-sticky-section-no e-con e-parent\" data-id=\"62fa586e\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-f3720c3 elementor-widget elementor-widget-heading\" data-id=\"f3720c3\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h1 class=\"elementor-heading-title elementor-size-default\">How Often Should You Replace Your Car\u2019s Spark Plugs? Here\u2019s What Experts Say<\/h1>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-c03b925 elementor-widget elementor-widget-image\" data-id=\"c03b925\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"768\" height=\"512\" src=\"https:\/\/kingdomautocare.com\/wp-content\/uploads\/2025\/12\/16586-768x512.jpg\" class=\"attachment-medium_large size-medium_large wp-image-8031\" alt=\"spark plug replacement interval\" srcset=\"https:\/\/kingdomautocare.com\/wp-content\/uploads\/2025\/12\/16586-768x512.jpg 768w, https:\/\/kingdomautocare.com\/wp-content\/uploads\/2025\/12\/16586-300x200.jpg 300w, https:\/\/kingdomautocare.com\/wp-content\/uploads\/2025\/12\/16586.jpg 1000w\" sizes=\"(max-width: 768px) 100vw, 768px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-27ead5f6 elementor-widget elementor-widget-text-editor\" data-id=\"27ead5f6\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\n<p class=\"\">Hey, I\u2019m Steve. I\u2019ve spent more years than I can count under the hood of cars, trucks, and SUVs, and if there\u2019s one thing I\u2019ve learned, it\u2019s this: <strong>spark plugs don\u2019t get enough respect<\/strong>.<\/p>\n\n\n\n<p class=\"\">They\u2019re small, cheap compared to most engine parts, and completely ignored\u2014until the car starts running rough. Then suddenly everyone\u2019s asking questions about spark plug replacement interval and whether they\u2019ve waited too long.<\/p>\n\n\n\n<p class=\"\">Let\u2019s clear it all up, shop-talk style. No scare tactics. No overcomplication. Just real advice from someone who sees this every week.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">What Spark Plugs Actually Do (And Why They Matter More Than You Think)<\/h2>\n\n\n\n<p class=\"\">Spark plugs do one simple but critical job: <strong>they ignite the air\u2013fuel mixture inside your engine<\/strong>. That tiny spark is what keeps your car moving.<\/p>\n\n\n\n<p class=\"\">When spark plugs are healthy:<br>\u2714\ufe0f smooth acceleration<br>\u2714\ufe0f good fuel economy<br>\u2714\ufe0f easy starts<br>\u2714\ufe0f clean combustion<\/p>\n\n\n\n<p class=\"\">When they\u2019re worn out? Everything suffers.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">A quick story from the bay<\/h3>\n\n\n\n<p class=\"\">I once had a customer convinced his engine was \u201cdying.\u201d The car shook at idle, hesitated on the highway, and burned gas like crazy. Turns out the spark plugs were original\u2014with over 140,000 miles on them. We replaced them, and the guy thought we\u2019d rebuilt the engine. Nope. Just gave it the spark it needed again \ud83d\udd27<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">What Experts Mean by \u201cSpark Plug Replacement Interval\u201d<\/h2>\n\n\n\n<p class=\"\">This is where most of the confusion starts.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">The short answer<\/h3>\n\n\n\n<p class=\"\">Your spark plug replacement interval depends on <strong>what type of spark plugs your engine uses<\/strong> and <strong>how you drive<\/strong>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">The longer, more honest answer<\/h3>\n\n\n\n<p class=\"\">Manufacturers give ideal conditions. Real life? Not so ideal.<\/p>\n\n\n\n<p class=\"\">Heat, traffic, short trips, towing, cheap fuel\u2014it all shortens spark plug life.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Average Spark Plug Replacement Intervals (Real-World Numbers)<\/h2>\n\n\n\n<p class=\"\">Let\u2019s break it down in plain English.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Copper Spark Plugs<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"\"><strong>Interval:<\/strong> ~20,000\u201330,000 miles<\/li>\n\n\n\n<li class=\"\">Older vehicles mostly<\/li>\n\n\n\n<li class=\"\">Cheap, but wear fast<\/li>\n<\/ul>\n\n\n\n<p class=\"\">These were common years ago. They work fine\u2014but they don\u2019t last long.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Platinum Spark Plugs<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"\"><strong>Interval:<\/strong> ~60,000 miles<\/li>\n\n\n\n<li class=\"\">More durable<\/li>\n\n\n\n<li class=\"\">Found in many mid-range vehicles<\/li>\n<\/ul>\n\n\n\n<p class=\"\">A good balance of cost and longevity.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Iridium Spark Plugs<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"\"><strong>Interval:<\/strong> 90,000\u2013120,000 miles<\/li>\n\n\n\n<li class=\"\">Used in most modern cars<\/li>\n\n\n\n<li class=\"\">Expensive upfront, long-lasting<\/li>\n<\/ul>\n\n\n\n<p class=\"\">Here\u2019s the catch: when iridium plugs finally wear out, they usually cause <strong>bigger drivability problems<\/strong> because the engine is tuned very precisely.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Why \u201cLonger Interval\u201d Doesn\u2019t Mean \u201cForget About It\u201d<\/h2>\n\n\n\n<p class=\"\">I hear this all the time:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"\">\u201cMy plugs are rated for 100,000 miles, so I\u2019m good.\u201d<\/p>\n<\/blockquote>\n\n\n\n<p class=\"\">Not always.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Real-world conditions that shorten spark plug life<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"\">short trips (engine never fully warms up)<\/li>\n\n\n\n<li class=\"\">stop-and-go traffic<\/li>\n\n\n\n<li class=\"\">aggressive driving<\/li>\n\n\n\n<li class=\"\">towing or hauling<\/li>\n\n\n\n<li class=\"\">oil consumption issues<\/li>\n<\/ul>\n\n\n\n<p class=\"\">I\u2019ve pulled \u201c100k-rated\u201d spark plugs at 70k that were already causing misfires. Waiting too long costs more later.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Signs Your Spark Plugs Are Wearing Out<\/h2>\n\n\n\n<p class=\"\">Spark plugs usually don\u2019t fail all at once\u2014they slowly degrade.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Common symptoms I see in the shop<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"\">rough idle or shaking<\/li>\n\n\n\n<li class=\"\">sluggish acceleration<\/li>\n\n\n\n<li class=\"\">longer crank time when starting<\/li>\n\n\n\n<li class=\"\">engine misfires<\/li>\n\n\n\n<li class=\"\">blinking check engine light \ud83d\ude2c<\/li>\n\n\n\n<li class=\"\">noticeable drop in MPG<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Another shop moment<\/h3>\n\n\n\n<p class=\"\">A customer once ignored a flashing check engine light for weeks because \u201cthe car still drove.\u201d Bad idea. The worn spark plug caused repeated misfires, which damaged the catalytic converter. A few hundred-dollar maintenance job turned into a few-thousand-dollar repair. That one hurt to explain.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">What Happens If You Ignore Spark Plug Replacement?<\/h2>\n\n\n\n<p class=\"\">Let\u2019s talk consequences\u2014because they\u2019re real.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Short-term problems<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"\">reduced power<\/li>\n\n\n\n<li class=\"\">poor fuel economy<\/li>\n\n\n\n<li class=\"\">annoying engine vibrations<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Long-term damage<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"\">failed ignition coils<\/li>\n\n\n\n<li class=\"\">raw fuel damaging the catalytic converter<\/li>\n\n\n\n<li class=\"\">overheating engine components<\/li>\n\n\n\n<li class=\"\">costly emissions failures<\/li>\n<\/ul>\n\n\n\n<p class=\"\">Spark plugs are cheap insurance. Ignoring them is gambling \ud83c\udfb2<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Can You Replace Spark Plugs Yourself?<\/h2>\n\n\n\n<p class=\"\">Sometimes yes. Sometimes\u2026 please don\u2019t \ud83d\ude05<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">DIY works when:<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"\">plugs are easy to access<\/li>\n\n\n\n<li class=\"\">you have the right tools<\/li>\n\n\n\n<li class=\"\">you know torque specs<\/li>\n\n\n\n<li class=\"\">you understand proper gap settings<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">DIY goes wrong when:<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"\">plugs snap off in the cylinder head<\/li>\n\n\n\n<li class=\"\">threads get cross-threaded<\/li>\n\n\n\n<li class=\"\">coils get damaged<\/li>\n\n\n\n<li class=\"\">wrong plug type is installed<\/li>\n<\/ul>\n\n\n\n<p class=\"\">Modern engines pack everything tight. I\u2019ve had plenty of cars towed in after a \u201csimple\u201d DIY spark plug job went sideways.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">How Driving Habits Affect Spark Plug Life<\/h2>\n\n\n\n<p class=\"\">Your spark plug replacement interval isn\u2019t just about mileage.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Driving habits that shorten plug life<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"\">frequent short trips<\/li>\n\n\n\n<li class=\"\">heavy loads or towing<\/li>\n\n\n\n<li class=\"\">idling for long periods<\/li>\n\n\n\n<li class=\"\">poor fuel quality<\/li>\n<\/ul>\n\n\n\n<p class=\"\">Highway drivers usually get more life out of spark plugs than city drivers. That\u2019s just reality.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Choosing the Right Spark Plugs (This Matters More Than You Think)<\/h2>\n\n\n\n<p class=\"\">Not all spark plugs are interchangeable.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">What goes wrong most often<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"\">wrong heat range<\/li>\n\n\n\n<li class=\"\">incorrect gap<\/li>\n\n\n\n<li class=\"\">cheap aftermarket plugs<\/li>\n\n\n\n<li class=\"\">\u201cperformance\u201d plugs that don\u2019t match OEM specs<\/li>\n<\/ul>\n\n\n\n<p class=\"\">I\u2019ve seen engines run worse after a tune-up because the wrong plugs were installed. Always match what the engine was designed for.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Steve\u2019s Honest Recommendation<\/h2>\n\n\n\n<p class=\"\">Here\u2019s my real-world advice:<\/p>\n\n\n\n<p class=\"\">\u2714\ufe0f follow manufacturer intervals\u2014but don\u2019t push them<br>\u2714\ufe0f replace spark plugs early if symptoms appear<br>\u2714\ufe0f don\u2019t wait for a misfire to tell you it\u2019s time<br>\u2714\ufe0f consider your driving habits, not just mileage<\/p>\n\n\n\n<p class=\"\">Spark plug replacement isn\u2019t glamorous\u2014but it\u2019s one of the best things you can do for engine health.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Quick FAQs<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">How long do spark plugs really last?<\/h3>\n\n\n\n<p class=\"\">Anywhere from 30,000 to 120,000 miles depending on type and driving conditions.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Can bad spark plugs damage my engine?<\/h3>\n\n\n\n<p class=\"\">Yes\u2014especially ignition coils and catalytic converters.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Should ignition coils be replaced at the same time?<\/h3>\n\n\n\n<p class=\"\">Only if they\u2019re failing\u2014but worn plugs can shorten coil life.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">How long does spark plug replacement take?<\/h3>\n\n\n\n<p class=\"\">Usually 1\u20132 hours, depending on the engine layout.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Ready to Take Care of Your Engine the Right Way?<\/h2>\n\n\n\n<p class=\"\">If you\u2019re not sure where you are in your spark plug replacement interval\u2014or you\u2019re already feeling symptoms\u2014don\u2019t guess.<\/p>\n\n\n\n<p class=\"\">At <strong>Kingdom Autocare<\/strong>, we\u2019ll inspect your spark plugs, explain exactly what we see, and only recommend what your car actually needs. No pressure. No upsells. Just honest work from people who care about your ride.<\/p>\n\n\n\n<p class=\"\">\ud83d\udc49 <strong>Book your appointment with Kingdom Autocare today<\/strong> and keep your engine running smooth, efficient, and reliable \ud83d\ude97\u2728<\/p>\n\n\n\n<p class=\"\">ChatGPT can make mistakes. Check important info. See <a>Cookie Preferences<\/a>.<\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>How Often Should You Replace Your Car\u2019s Spark Plugs? Here\u2019s What Experts Say Hey, I\u2019m Steve. I\u2019ve spent more years than I can count under the hood of cars, trucks, and SUVs, and if there\u2019s one thing I\u2019ve learned, it\u2019s this: spark plugs don\u2019t get enough respect. They\u2019re small, cheap compared to most engine parts, and completely ignored\u2014until the car starts running rough. Then suddenly everyone\u2019s asking questions about spark plug replacement interval and whether they\u2019ve waited too long. Let\u2019s clear it all up, shop-talk style. No scare tactics. No overcomplication. Just real advice from someone who sees this every week. What Spark Plugs Actually Do (And Why They Matter More Than You Think) Spark plugs do one simple but critical job: they ignite the air\u2013fuel mixture inside your engine. That tiny spark is what keeps your car moving. When spark plugs are healthy:\u2714\ufe0f smooth acceleration\u2714\ufe0f good fuel economy\u2714\ufe0f easy starts\u2714\ufe0f clean combustion When they\u2019re worn out? Everything suffers. A quick story from the bay I once had a customer convinced his engine was \u201cdying.\u201d The car shook at idle, hesitated on the highway, and burned gas like crazy. Turns out the spark plugs were original\u2014with over 140,000 miles on them. We replaced them, and the guy thought we\u2019d rebuilt the engine. Nope. Just gave it the spark it needed again \ud83d\udd27 What Experts Mean by \u201cSpark Plug Replacement Interval\u201d This is where most of the confusion starts. The short answer Your spark plug replacement interval depends on what type of spark plugs your engine uses and how you drive. The longer, more honest answer Manufacturers give ideal conditions. Real life? Not so ideal. Heat, traffic, short trips, towing, cheap fuel\u2014it all shortens spark plug life. Average Spark Plug Replacement Intervals (Real-World Numbers) Let\u2019s break it down in plain English. Copper Spark Plugs These were common years ago. They work fine\u2014but they don\u2019t last long. Platinum Spark Plugs A good balance of cost and longevity. Iridium Spark Plugs Here\u2019s the catch: when iridium plugs finally wear out, they usually cause bigger drivability problems because the engine is tuned very precisely. Why \u201cLonger Interval\u201d Doesn\u2019t Mean \u201cForget About It\u201d I hear this all the time: \u201cMy plugs are rated for 100,000 miles, so I\u2019m good.\u201d Not always. Real-world conditions that shorten spark plug life I\u2019ve pulled \u201c100k-rated\u201d spark plugs at 70k that were already causing misfires. Waiting too long costs more later. Signs Your Spark Plugs Are Wearing Out Spark plugs usually don\u2019t fail all at once\u2014they slowly degrade. Common symptoms I see in the shop Another shop moment A customer once ignored a flashing check engine light for weeks because \u201cthe car still drove.\u201d Bad idea. The worn spark plug caused repeated misfires, which damaged the catalytic converter. A few hundred-dollar maintenance job turned into a few-thousand-dollar repair. That one hurt to explain. What Happens If You Ignore Spark Plug Replacement? Let\u2019s talk consequences\u2014because they\u2019re real. Short-term problems Long-term damage Spark plugs are cheap insurance. Ignoring them is gambling \ud83c\udfb2 Can You Replace Spark Plugs Yourself? Sometimes yes. Sometimes\u2026 please don\u2019t \ud83d\ude05 DIY works when: DIY goes wrong when: Modern engines pack everything tight. I\u2019ve had plenty of cars towed in after a \u201csimple\u201d DIY spark plug job went sideways. How Driving Habits Affect Spark Plug Life Your spark plug replacement interval isn\u2019t just about mileage. Driving habits that shorten plug life Highway drivers usually get more life out of spark plugs than city drivers. That\u2019s just reality. Choosing the Right Spark Plugs (This Matters More Than You Think) Not all spark plugs are interchangeable. What goes wrong most often I\u2019ve seen engines run worse after a tune-up because the wrong plugs were installed. Always match what the engine was designed for. Steve\u2019s Honest Recommendation Here\u2019s my real-world advice: \u2714\ufe0f follow manufacturer intervals\u2014but don\u2019t push them\u2714\ufe0f replace spark plugs early if symptoms appear\u2714\ufe0f don\u2019t wait for a misfire to tell you it\u2019s time\u2714\ufe0f consider your driving habits, not just mileage Spark plug replacement isn\u2019t glamorous\u2014but it\u2019s one of the best things you can do for engine health. Quick FAQs How long do spark plugs really last? Anywhere from 30,000 to 120,000 miles depending on type and driving conditions. Can bad spark plugs damage my engine? Yes\u2014especially ignition coils and catalytic converters. Should ignition coils be replaced at the same time? Only if they\u2019re failing\u2014but worn plugs can shorten coil life. How long does spark plug replacement take? Usually 1\u20132 hours, depending on the engine layout. Ready to Take Care of Your Engine the Right Way? If you\u2019re not sure where you are in your spark plug replacement interval\u2014or you\u2019re already feeling symptoms\u2014don\u2019t guess. At Kingdom Autocare, we\u2019ll inspect your spark plugs, explain exactly what we see, and only recommend what your car actually needs. No pressure. No upsells. Just honest work from people who care about your ride. \ud83d\udc49 Book your appointment with Kingdom Autocare today and keep your engine running smooth, efficient, and reliable \ud83d\ude97\u2728 ChatGPT can make mistakes. Check important info. See Cookie Preferences.<\/p>\n","protected":false},"author":1,"featured_media":8031,"comment_status":"open","ping_status":"open","sticky":false,"template":"elementor_header_footer","format":"standard","meta":{"nf_dc_page":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-8025","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.7 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>How Often Should You Replace Your Car\u2019s Spark Plugs? Here\u2019s What Experts Say<\/title>\n<meta name=\"description\" content=\"Not sure about the right spark plug replacement interval? 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