Bearing ware

[Francis]

Hi Guy's, there is a 302 Cleveland Ford engine that a mate of mine has, I didn't do the engine, but it's said to of been rebuilt 20,000 kms ago. We have noticed that there are specks of copper through the drained oil every time we have drained the oil, so I'm guessing its rubbing on the bearings. It's also developed a rear seal leak, so it wasn't done to good. But I was just thinking what's going to be the best oil to use to maximise the life out of the thing until we build him another one? I was once told that there are some oils that use a polymer based anti scuff additive that are better for this type thing. Does that sound right to you's?