[Got the Bug]

Originally Posted by mpanten

I think either would be good. The guy i talked to did mention that the small block windsors like yours and mine tend to suffer from low idle oil pressure. I was running 15/40 diesel before so i was pretty close to what I was running. I would not be afraid to run either. He also mentioned that the aluminum tends to expand and contract a little more and the heavier weight would be helpful.

This has probably been covered before, but is there any issue with mixing different weight oils of the same brand?