Originally Posted By: Greasymechtech
It's data. Better than shooting in the breeze. So, where's any data proving 20w50 is so great?
It's a pity when the only argument discounts UOA data compared to nothing. Too funny.
Well I guess when people do not have hard facts, they fall back on manufacturers recommendations and what has worked and served them well for years.
The highest millage I have ever put on an engine without a rebuild was 500k, that engine was run exclusively, in Canada, on 20w-50
I DO now run lighter oils (I tend to follow manufacturers recommendations) but, I admit, I do tend to lean to the Higher viscosity side.
I could turn your question around:
Where is the data proving lighter oil is better?