I am running 10w30 at the moment for summer but I usually run 5w30... some people are saying 15w50 for the best lubrication... can we lay it down? I'm in california also...

 

If you have stock internals I would just use the 10-30. You could use 5-30 in the winter but I also live in Ca and depending where you are you could probably just use the 10-30 year round. On my 385 because it has different tolerances than the stock motor I'm using 20-50

 

I run 10W30 in mine year round. I spoke to the engine builder and he told me 10W30 is best for my set up. I do tend to warm up my car in the winter time for about 5 mintues before I drive it to work.

Thx,
Claude