[Dave-ROR]

Originally Posted by Chimpo

He never said what he did for Toyota (at least not in this thread) right? His location is Diamond Bar, and that's within an acceptable driving distance to Torrance where Toyota's Motor Sales HQ is located, and they would use engineers (at least Honda's sales arm "American Honda Motors" does... which ironically is also located in Torrance).
While I have no issue with running 5w-30 thru the car (especially if it's being tracked), there is also the possibility he may not be as un-informed as everyone wants to believe.

Then he can provide data and evidence that 0W-20 is better than what the engineers had suggested in the owner's manual and what the data gathered in the real world shows. 0W-20 is THIN, it's *great* for fuel economy. Based on pressures I've read I'm not convinced it's much good at protecting the engine under sustained high temp/load usage. I wouldn't say go crazy with oil weights here as clearances aren't going to be spec'd for super thick oil either until these engines get some wear into them and loosen up.

Of course Honda (well Honda Racing/HPD) engineers suggest we use heavier oil than the manual shows in my race car. Because of our bearing clearances and usage, we run 15W-50..

Regardless none of this banter is helping the OP. If there's real damage then cause can be examined.

Casso: Which tires are you running again? Big 255s?