Originally Posted By: atikovi
Originally Posted By: Bob570
If your engine is making lifter noise at 60F because the oil is too thin, then it's only going to get worse as the engine warms up.
As the engine warms up, the 0W properties become 40W so not necessarily.
No, that's not how it works.
His point was that if the oil is supposedly too thin at startup the it'll be even thinner as the engine warms up, and a 5w40 and 0w40 are equally thin at operating temp.