04-30-2008, 11:52 AM
WRXtranceformed Wrote:I noticed an instant 3-4mpg increase in fuel efficiency by switching to RP engine and gear oil. I would have kept it in my tranny except that it's apparently too slippery for it. Could be the butt dyno too, but the car feels not nearly as smooth or responsive since I tried Mobile 1 again for my last oil change. I've got a case of RP waiting to go in for the next one.
really 3-4? That seems like a super high increase from oil alone. what did you have in there before? anyone else see something like this or even think its possible?
If it is really true i am switching today. at 3.75 a gal its well worth it