Re: 5w-30 or 10w-40 or ?
Sorry, don't remember you build ...
Is this engine built to spec.s that require/use 5w oils?
If it's a non-LS SBC, I would recommend the 10w base for some street units, 15~20w for others - dependant more on spec.s and conditions it is operated in ...
Other V8 things - some of which float
Other V6 things - none of which float
Oh yeah, and 1 "Straight-Six" ...
If a man says something in the garage - and his wife can't hear him - is he still wrong !!!