I know that NGK and Densos are supposedly the best plugs to get, but why does my Helms manual say not to use platinums in my 96 LS Integra. The Helms says to use either NGK or Denso Platinums for GSR's, but not for LS's. Also, does non-platinum include iridium plugs?

What are the possible drawbacks of using copper, platinum, or iridium plugs? I know there's price differences, but I once heard something about platinum plugs damaging cylinder heads???

Thanks.

 

Copper is what comes stock in the LSes. That's all.

Copper - best spark, best performance

Platinum - lasts 50,000mi.

Iridium - Lasts 100,000mi. Costs a nice chunk of change.

 

Copper is generally 10K - 25K miles right?

Any other issues with platinum?

 

Depends on your driving habits, quality of tune your car has, etc. Copper plugs are so cheap that I'd change them as frequently as feels right to you. Have an extra set sitting around, and whenever you're under the hood, pull your spark plugs, look at them. If they're good, throw them back in. If the electrode is rounded, pitch them.


Platinums are used OEM in probably 90% of the cars built today. No issues.

 

i use double platinum bosch and there fine. a mechanic i talked to said plugs do not really matter(as far as brand) until you start building the engine.