Review of Schaeffer Oil
I must say that I am impressed with the results of changing the oil to the Schaeffer Supreme 7000 series.
The cold start knock in the top end of the engine is gone.....(common w/5.4 3v engine.)
After two tanks,gas mileage has gone up 1.467 mpg,I am not changing the way I drive at all.
This might be the placebo effect,but it seems to be idling smoother.
I will post a UOA up after I get about 4k for miles racked up on it.