Is it worth it? Platinums should be changed every 60,000 compared to Iridiums at 100,000 miles. If its an only daily car, id probably go for the basic>moderate performance plugs. This means that spark plugs can have even finer electrodes than ever before and still have excellent wear characteristics. Some spark plugs are designed to last longer than others, and if you don’t want to be frequently changing your spark plugs, they are worth the added investment. Still have questions? Why is vibration damper pulley wobbling? Some even use the noble metals for the core of the plug. The bike even idles smoother. Join Yahoo Answers and get 100 points today. I pay $7 for Iridium plugs. However, they’ve been known to go up to 80,000 miles, or even 120,000 miles, depending on the vehicle. Iridium spark plugs cost around eight bucks to fifteen bucks. Since the Iridium is really small at 0.4mm these do not last as long as Denso Iridium Long Life plugs with 0.7mm tips or the NGK Iridium plugs. When you make the switch to iridium spark plugs, then you may notice an immediate improvement to your acceleration profile. Most spark plugs aren’t made to last forever. Iridium spark plugs have a much finer center electrode. For cars where it's easy to do them, no need to waste the extra money on the ruthenium all the following spark plugs are compatible for my car. double platnums (where the tip and electrode are both platnum metal) are good for about 60,000. an Iridium tipped plug should be good for about 85,000. the manufacturers say 100,000, even 110,000. The move to iridium plugs could potentially be a performance advantage. You may never actually have these spark plugs … Get your answers by asking now. :bowdown This has been the opinion of the butt-dyno and the butt-dyno only. 1. if you do a lot of driving, then yes, it's worth the extra so you don't have to swap plugs as soon, but remember, don't leave a plug in more than 80,000. the manufacturer doesn't care about the details, the idea is to get you to buy their car because you don't have to do a tuneup as frequently. on the periodic table the elements seem equally as dense. One of these “evolutionary leaps” was iridium spark plugs (some call it platinum). "-thus saith my butt-dyno. 30,000 mile intervals is for the plain copper type of plug, the electrodes wear out and you can see this by the round center electrode. In this video we review how long do NGK Iridium Spark Plugs last and what they look like after 100,000 miles. But yes Iridium is far Superior. it's designed to last longer and not erode like a regular platnum or copper plug. There is no close match for your standard spark plug, it isn't worth compromising plug design purely to use an Iridium plug type. Why does my 2005 Jeep Grand Cherokee keep needing to be jumped? You can sign in to vote the answer. Why are most auto shops open Monday through Friday from 8-5? I saw a plug the other day, an NGK of all plugs that separated in the head. Some vehicles - you can only get Iridium plugs for (wifes Lexus ES-350). And that spark is highly concentrated. Being able to run hotter without igniting the mixture allows the spark plug to be self-cleaning. Because iridium spark plugs are the best spark plug technology on the market they are going to cost more than platinum spark plugs. :banana Just like rayzzr said. They're NOT looking for longevity...just performance. It is not advisable to leave the spark plugs in any engine for 100K since you may not get the plugs out of the cylinder head after this length of service and time. if you do a lot of driving, then yes, it's worth the extra so you don't have to swap plugs as soon, but remember, don't leave a plug in more than … How are eBay sellers selling new items for cheaper than shipping costs? Copper plugs provide better spark because copper has less resistance than other metals (even platinum and iridium) but don't last as long since copper is a softer metal. Much depends on their job – stable operation, ignition (both cold and hot), fuel consumption and even power. Get your answers by asking now. When the dealer reads my key everything is okay but sometimes the inactive light comes on and is shaky why? These are both costly metals, so aftermarket brands often use low grade platinum or iridium to cut their costs. Platinum = Longetivity true, but the gap cant be adjusted as easily as copper plugs, but better than iridium as you cant gap iridium plugs (metal is too hard and fragile). Iridium spark plugs are mostly used in high-performance vehicles and are considered the most efficient spark plugs. Iridium plug are usually called for in applications with extended usage like 50-105k miles. Why are most auto shops open Monday through Friday from 8-5? The reason why the other metals are used is because they have a longer service life and can easily go 100,000 miles unlike the coppers which are recommended for about 30,000 miles. usually the tip is a needle point tip or fine wire tip. If its daily and track, or just track, go with the iridium, since they cost heaps, and racing and thrashing cause more heart break, im sure the iridium plugs will last so much longer, and a bit of a performace gain. Iridium spark plugs are perfect to use on high-performance engines. 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