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Most modern cars run platinum spark plugs which are designed for longevity and can go 100K miles or more. IIRC I replaced them on my Infiniti's VQ35DE at 115K miles and they looked brand new.
Now, back in the 80's and 90's cars were still rolling off the line with copper spark plugs installed. Those required a 30K mile replacement interval.
A friend recently purchased a new Honda Civic, and he mentioned that the spark plugs are supposed to be replaced every 30,000 miles. Is this common on new vehicles today? My (older) Accord has a 100,000 mile interval for plugs.
Toyota recommends replacement at 120K miles for most of their sedans. Not sure about other cars.
My AWD, turbo DSM from 1991 needed it's plugs changed every 75k.
My RWD turbo Volvo from 1992 needs it's plugs changed every 100k.
My AWD turbo WRX from 04 needed it's plugs changed every 100k.
My FWD turbo Fiesta ST from 15 needs it's pugs changed every 100k
Only thing I've seen that needs spark plugs that often is the 5.7L Hemi V8 from ChryCo. Older ones "say" to replace the plugs every 36K (sucks, because you're replacing 16 of them at a time!). Newer ones don't even need that, my 2016 Hemi says replace 'em every 100K. The V6 in my last Jeep was every 100K as well.
Since 2009, the 5.7 "Hemi" uses iridium spark plugs which are supposed to last at least 100,000 miles and should last longer than that. (I think mine fell a little short of the 100,000 mark, but I do not remember with certainty anymore.). Good thing because there are 16 of them and they are expensive and hard to find a complete set. Also a PIA to get to.
Older cars and cheap cars that use copper/nickle plugs will often only last 30K miles or less. Some last a lot longer. There does not seem to be any pattern, you just have to check them from time to time, replace them on the schedule i the manual or wait until you get a misfire code.
A friend recently purchased a new Honda Civic, and he mentioned that the spark plugs are supposed to be replaced every 30,000 miles. Is this common on new vehicles today? My (older) Accord has a 100,000 mile interval for plugs.
I very much doubt that this is correct. Exact year and model Honda and I can look it up. I am a repair shop owner.
100,000 is fine for any modern Honda. 30,000 mile spark plug replacements haven't been necessary since the 80's... and even back then a lot of vehicles would go 60K between plug replacements.
My wife's 2004 Accord is supposed to have the plugs replaced at 100K. They're iridium. I pulled them out at 85K when we got the car, and they looked nearly new. So I put some antiseize on them and put them back in. The car is getting close to 180K now. Within the next year or so I'll probably replace those plugs whether they need it or not
One point I'll make though... having cursed the galvanic corrosion where aluminum meets steel more times than I care to recount: I would personally NOT go 100,000 miles without removing the original plugs. Because steel and aluminum do not play well together, and OEM's may or may not address this. In other words, I'd remove those plugs at some point before 100k miles and put antiseize on them. Granted this isn't exactly necessary as plugs will come out with no problem 95% of the time... but that 5% is a real pain. And potentially expensive. Antiseize solves this problem
You beat me to this. I also don't "trust" 100K replacement intervals. When I get a "new to me" car, I pull the plugs first chance I get, put on anti-seize, maybe replace them or maybe not depending on what they look like.
BTW I have had *really* good luck with NGK brand plugs, not only in Japanese cars that generally come with them from the factory, but also older Detroit cars, German cars, etc.
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