genie, knock it off. kriste on a crutch.

First of
all, 5 weight oil doesn't "lube better" than 40 weight oil.

it most certainly does, during the seconds it takes for pressure oil of a just
started cold (meaning not at operating temp) engine to reach all the bearings
needing pressure oil. 5w oil flows more easier at starting temp than does 40w
(ob vee us frickin' lee). that clatter you hear (well, a qualified mechanic
hears) on a just started engine is the bearings grinding and rubbing and
clashing with no pressue oil present. even a 14 year old can hear the
difference in the sound of a just started engine with heavy oil in it and the
same engine run 30 or 40 seconds.

genei, go stand in the corner.