[jdmccright]

Most spark plugs are rated to work in a specific "heat range" though there are no specifics on what that range is for each vehicle. Plugs that run too hot for a particular engine, such as plugs with platinum (Pt) tips that are billed as OEM replacements for regular copper core plugs, tend to cause predetonation under load and also just don't last because of the extra heat.

Now, there are Pt plugs that do work and there are even some cases where they may help, but mostly for modified engines that are designed to accommodate these higher heat range plugs. A good search in this forum for spark plug recommendations is a good way to find out the good, the bad, and the ugly for your engine.

Quite frankly, I've got normal Bosch Pt (I think) plugs, not the stupid +2 or +4 electrode jobbers, in my '92 Cam 5SFE and they've been running for well over 100k miles (hafta check my service logs it's been that long!)...would I buy them again? Maybe. I haven't seen any degradation nor improvement in performance, but that's not to say I'd get the same longevity from a standard set for 1/2 the price.

I'll check my logs and see if I wrote down what I put in and when...got my curiosity up now...and edit this post.