Thread: Synthetic Oils

Originally Posted by f3racer

ok so after using the cobalt on 5w 30 royal purple for the last couple weeks we have noticed a 2 mpg average gain over a the 850 miles we have put on the car. no real noticeable hp gain on the butt dyno. does seem to take a little longer to warm up in very cold weather but also stays cooler through out the drive. looks like the 145k mile ford explorer will be next on the testing block.

You can't really base MPG on a "better" oil just because you changed it unless you ran exact trips going exactly the same speed with same temperatures, same throttle patterns and many other factors.......

I've heard many people claim MPG gains on oil and i just can't make sense of the theories. I understand less restriction/friction helping an engine run better but it's nearly impossible to prove a theory unless your car is controlled by a computer running it through identical processes.

I personally run a synthetic with Lucas Oil Stabilizer. The synthetic usually differs, however I guess my "favorites" are Castrol Syntec Full Syn and Mobil 1.

Originally Posted by postalc38

You can't really base MPG on a "better" oil just because you changed it unless you ran exact trips going exactly the same speed with same temperatures, same throttle patterns and many other factors.......

i did that. the oil i removed only had 1k miles on it.