Royal Purple.....

[Rick Leininger Jr.]

Originally Posted by Wade_Owens

Billy, in this instance, I'm sure it is not. I have had both engines apart after the break in period and a couple of races for inspection. I cleaned out the residue each time. After running both engines again, I found the same thing. At first I thought it may be some of the Comp lifter additive, but it does this without it, too. The bearings do look perfect in both engines. I wonder how early this is occuring and how much protection the oil still has after this seperates and lands in the pan.....

Wade

Wade, It may not apply to your situation, but I have seen the black paste in a circle track engine after about 500 miles when using the 10-30 Gibbs. I was told the paste was moly, but I did not verify that. I switched to another oil that made more hp on the pump after freshening that motor up, and have not got it back yet to see if it produced any paste.

An engine shop I used to work for saved some of the used RP, after sitting a while a black film would form at the bottom of the jug, not sure if it is the same black paste you are referring to.