Castrol synthetic or Valvoline?

And one last thing.


540rat was kicked off speed talk not because he had a different opinion but because several guys who are way smarter than 540rat is exposed his piss poor test methods.

You can't use his results if his testing protocol is suspect. And it is.

Go to speedtalk.com and do a search. He was exposed. Almost the same as Troy Patterson.

Caveat Emptor.