What would be a good oil for the first start after coming back from the machine shop. It's a 4 cylinder gas engine. I did not get much info on oil choice from the shop. Still has original cam and lifters. Of course it has new rings. I'm planning on 10w30 or 15w40 HDEO for it's normal fill. Would that be good for "break in"? I also have some 10w30 and 30w pcmo of either of those would be better for the first start. Thanks for any opinions.