Originally Posted By: ryland
just wanted to throw it out there that I used synpower once when it was on sale and it made my engine very loud, so loud that my wife told me the car sounded like [censored] and that I should change the oil. I changed at 2k and the oil was black!!!! At that point in my cars life I was always useing PP and after that I went back to it and my motor was smooth and quiet again. Dont really know what the problem was but based on that I'll never use it again, take it for what its worth.
For it to be black after 2000 miles, maybe it was cleaning out
the engine gunk that PP left behind.