Royal Purple.....

[Monte Howard]

I have had that myself with RP, But I always had good luck with it,so I never worried, my bearings always looked good on my stocker w/RP #9.Changed oil every 40 runs.

[Billy Nees]

Are you sure that it's not leftovers from your assembly lube?

[Alan Roehrich]

It can also be "fallout" from the racing fuel, and condensation. I found it in one of ours, that had never seen anything but Joe Gibbs. The engine was actually in decent shape, the bearings looked okay, but it had well over 200 passes on it and it was dead tired.

[Wade_Owens]

Originally Posted by Billy Nees

Are you sure that it's not leftovers from your assembly lube?

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

[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.

[Wade_Owens]

Originally Posted by Rick Leininger Jr.

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.

Rick, I have noticed the same thing when I saved some "light weight" RP also. A blackish-gray film formed in the bottom of the clear jug.

Wade