Originally Posted By: tig1
Originally Posted By: Shannow
If you go back in time, I posted that M1 0W40 made the 3VZE in my 4Runner sound like a tin can full of rocks...and that was before the comment became popular...never experienced it with any other oil before or after.
That being said, the oil made no apprciable difference in my Nissan (but it's pretty clattery being a diesel).
Put M1 5W50 in my mower today after a run of straight 30, and it was appreciably quieter...ran hotter though.
That's a down side of thicker than necessary oils. Chevrolet had an engine in the late 80s or early 90s called the Quad 4 and it was very noisy. I had a couple of Dodge Slant 6 engines in the 60s and 70s that were noisy as well. Some engines are and some aren't
The Quad 4 was a Olds engine and the Chrysler slant 6 had solid lifters, they all ticked (or clacked if valves were out of adjustment)... Using 20W-50 would likely somewhat muffle the noise of rockers striking valve tip...