The best plugs are the ones with no oil on them!

Run the NGK's and Mobil 1 15-50. Can't go wrong. Many will argue one way or another but those are safe bets.

Valvoline racing straight 40 weight. Autolite plugs. Blown 498 8 pds boost 800HP no problems.

Twin 2001 502's:
Oil - Mobile 1 15-50 Gold Cap
Oil Filter - K&N Large
Plugs - AC Rapid Fire Platinum #1

Runs awesome, smooth idle and great acceleration!!!

engine:622ci na
oil: Rotella 15w40 diesel
filters: twin wix racing high flow

Nothing endures more torque loads than a commercial or marine diesel. It seems to work fine in big blocks.

Where can you buy Kendall GT-1 straight 40? Cant find it anywhere.

Pennzoil 20W50.

I just put some Bosch Platinum 4+ plugs in my 502, but haven't even run it yet. It had NGK's in it, but I swapped them for these. I know they're not as miraculous as they claim, but can't hurt right?

Anybody have any experience with these? Let me know if I'm screwing up!!

we have found bosh plat to be a really bad idea on blower motors. The gap is to large and blows out the flame. Its like a grenade when it finally fires. Otherwise I have ran them in cars ect.. with no probs I prefer NGK V to me only plug I can truely read. Currently running torco oil straight 50 also run shafers.

My 502 is not blown. Stock, with EMI Thunder Headers. Bosch Plat. 4+ still a bad idea??

my experience with bosch platinum on my acura car was this: about 10000 miles on them and developed a misfire on two cylinders, pulled the plugs and found the porcelin part near the electrode gone on both of those spark plugs. Threw them in the trash and put in the oem ngk plugs. Same thing has happened to me on champion spark plugs in my snowmobiles. The sleds get only ngk now as well.