Hi I am actually trying to find out the pro and cons in moving to a lighter visgrade oil for my ISX. It's class 8. Am using 15w40 now. Thinking of...
Btw, do the heavy duty OEMs actually recommend use of lower viscosity oil?
Hello. I understand that going to a lower viscosity grade may help in improving the fuel economy. This is already happening in the passenger car...
Thanks for the reply ! My main concern in moving toward a lighter visgrade is in durability (i.e. wear). I am pretty convince there will be some...