Hey guys. Just curious on your guys thoughts on this. I’ve always ran the factory oil weight of 5W-20 . Now I’ve had my engine completely overhauled top to oil pan. I’ve put roughly 600 miles on it since build and have changed the oil twice so far. The first 100 miles i ran Joe Gibbs break in oil , then just regular Penzoil after. Both 5w-20 . The end of the summer into fall i noticed a very faint blue smoke that happens ONLY on start up, you really have to look for it but it’s there . Now remember i had my heads completely redone with new seats , and seals. My buddy who owns a shop, builds motors , and races says don’t worry about it , it’s common for some to smoke on startup after sitting for a while and it may even clear up . So that leads to my question, what oil weight do you guys suggest after a complete rebuild ? Maybe I’m running to thin an oil and that’s why it’s getting past valve seals ? Should i run a slightly heavier weight oil ? I’m ready to get new Amsoil ordered for my car . Should i switch to 10W-30 ? Thanks guys
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