How often do you all change the plugs in your D2's?


What plug have you had the best results with?

 

I try to change mine every 20-30K if I remember and probably longer if the UG is not showing. I observe that sometimes misfires tend not to show again on UG. Platimum are the ones for the disco but Iridium works fine as well. Ive used them both. I cant really tell which one is better.

 

Currently 15K on Champion platinums. Prior to that, NGK iridium for 35K prior to failure.

 

I do NGKs every 25k or so. I actually like the copper plugs better in this engine, but both work.

 

It depends on what plugs are used.

The copper Champions a genius mechanic here installed years ago lasted only 13,000 miles.

The factory maintenance schedule shows a 120,000 mile interval for the double-platinum Champion 7070s (RC11 PYP B4), although I don't expect anyone waits that long. I now have 50,000 miles on the 7070s in my truck and they're still going strong.

There are dozens and dozens of threads about a question you didn't ask -- which plugs are "best"? Bosch. NGK. Iridium. All I know is that I'm getting great results from the 7070s.

 

I'm running Bosch platinums, just the regular plugs, not the +4s or whatever. I've seen 3 mpg or so increase over the old plugs. I plan on changing every 50000 km or so