You'll get enough different recommendations to further confuse you but I'll add another. Just got my relatively mild 427SO built. My engine builder recommended Joe Gibbs 10w-30 HR-2, which has an additive they call "storage protection" for cars that aren't driven every day. Claims to cling better and prevent internal rust and dry starts. No idea if it's a real benefit or snake
oil, but it is a trusted brand. The engine builders on this forum can add their professional opinion on
oil wt. and agree or disagree, but it is my understanding that unless you're tracking your car or driving it really hard a lot, a lighter wt. flows better and holds up fine. By the way, Joe Gibbs is now called Joe Gibbs Driven and eventually the Joe Gibbs name will be dropped.
Regards,
Kevin