I don’t think these very low viscosity oils have enough support for connecting metal parts. But I’m no engineer.
The lower viscosity oils are not the issue. The issue with these GM engines is their Active Fuel Management (AFM) system which deactivates cylinders in the attempt to increase fuel economy. Their AFM system is completely defective and almost every GM engine with it has failed or will soon fail.
“ don’t think these very low viscosity oils have enough support for connecting metal parts. But I’m no engineer”
I agree, the 0W-20 seems awfully light weight for a, in my case a 5.7 lter Tundra V8. However, the 5.7 Toyota V8’s are very reliable, unlike the V6 dual turbo engine that replaced it.
The clearances on these components are critical. I’m speaking as someone who’s built many different engines both Domestic and foreign over the decades. Clearances are something that can be modified but not abused.
Chevy used to be a engine that could be counted on as reliable.
It’s apparently not the case anymore.
I suggest that they contact the engine builders in the NHRA...
Same thoughts here.
We have been told for years that running thicker oil is always bad.
Due to tolerances in the bearings, etc.
Old school was to run thicker oil. Which car mfr’s respond with “this is no longer the case”
Wow, then for car manufacturers to say” use thicker oil for better bearing protection “
So which is it.
That and ethanol.