skeptical din ako sa petron rev-x all terrain. fully synthetic sya pero ang mura. ive asked on petron gas stations around. cheapest i can find is 250 / liter. actually there's a thread in here talking about the lab analysis of the used oil on a 4jx1-tc trooper. the results are positive.. im trying it on my next change oil.:P wondering though why it only has a CF-4 api service rating while the multigrade rev-x trekker has a higher CG/CH-4 grade.