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Originally Posted by my89_928gt
Hmmm, why not platimum?
I whent down to my local shop(reputable) and they sold me Bosch Platinum 4 spark plugs.
I have not put them on yet.
The only time I ever heard of not useing platinum plugs was in a heavly boosted engine. I also, thought they were platinum from the factory as cooper plugs will not last to 90,000 miles witch is when I understand they are to be changed.
Am I wrong??
Richard
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It's similar to the problem of using the platinum plugs in the 928. There's high compression and heat. The regular Bosch +4 plugs don't have a high enough heat rating to discipate the heat causing build-up and possible melting tips. Check out the 928 forum on rennlist.com if you want more info from people who have had this happen to them. I ordered the right ones and they are being replaced whenever they get here.