I have used QSUD 5w50 in my Ranger 570, which has an HTHS of 3.98cst @ 150C and is 17.1cst @ 100C. (The engine loved it.)
Mag1 (a favorite of mine) sells a 10w40 4T oil which has an HTHS of 3.91cst @ 150C and is 14.1cst @ 100C.
Given the HTHS values are almost the same, what effect would the ~3cst difference in 100C viscosity have on my engine?
The Polaris 570 engine was originally spec'd for 10w40, then it went to 5w50, fwiw.
Mag1 (a favorite of mine) sells a 10w40 4T oil which has an HTHS of 3.91cst @ 150C and is 14.1cst @ 100C.
Given the HTHS values are almost the same, what effect would the ~3cst difference in 100C viscosity have on my engine?
The Polaris 570 engine was originally spec'd for 10w40, then it went to 5w50, fwiw.