CB question:

[bonal]

It's a wash.  Running the engine to warm up the oil causes nearly a quart to remain in the upper part of the engine, which won't drain out.  Draining it cold is slow, but you could drain out all but the last quart from a cold engine and still get the same amount out of it.

Fwiw multi grade oil runs out pretty good when cold so long as it's not colder than ~50 degrees.

I just always wanted to use the phrase "lassis in winter time" in a sentence