Cavitation ?
Where specifically is that an issue ?
in general and big picture I still don't understand where op is coming from? Otherwise, I enjoy reading technical discussions even though I am not an expert. The problem is
many inconsistencies!
op contradicts himself sometimes within the same post and/or different threads.
Regarding engine oil viscosity:
For example in another thread he was basically saying that the manufacturers know what they are doing ... and if it was that easy to design engines we would all be making them ...
If that's the case, this discussion is irrelevant. Refer to the title: "How to determine correct oil grade for your car".
Just follow the manufacturer's recommendation!
In this or another thread he is using 0W-20 and the factory recommendation is iirc 0W-40 (town) and 10W-60 (racing) ...
at least I can understand those who use heavier than recommended oil viscosity. The logic (flawed or not) is that they don't trust the manufacturer due to CAFE. but the reverse (going much thinner) doesn't seem as logical.
Basically go by spec if you fully trust the manufacturer. Otherwise (CAFE theory) you have to go thicker.
Again, flawed or not those are the only two logical options.
I don't understand going thinner! Please help. lol
I am open to change my mind.