Rotella 15w40

in the 60's and 70's my dad and uncle would build their race engines with a quart of 30 wt, a jug of STP and wheel bearing grease.
They never flattened a lobe or lost a bearing.
Come to think of it, neither have I. lol
Neither have I # we must be doing something right or either we just Lucky & and Im good with either of those .