Royal purple 0-8w.

[Ed Wright]

I have shown up where I thought Class would be tough with the zero weight Royal Purple oil already in it. For various reasons, left it in for eliminations. Ran it all weekend. Not crazy about the low oil pressure at a warm idle, but saw Zero other issues.

If you are having to pay someone else to build your engine, you might want to ask them about it. They know your oil pump & bearing clearances.