The Ford Barn - View Single Post - Shell Rotella T6 15W40 vs Mobile One 10W30

Bruce of MN · 04-19-2023, 03:08 PM

It is my understanding that the 40 in 10W40 means it acts like 40W when hot. To me that means that it is pretty low viscosity when hot and why I am happy using it.

04-19-2023, 03:08 PM	#9
Bruce of MN Senior Member Join Date: May 2010 Location: VA Posts: 1,447	Re: Shell Rotella T6 15W40 vs Mobile One 10W30 It is my understanding that the 40 in 10W40 means it acts like 40W when hot. To me that means that it is pretty low viscosity when hot and why I am happy using it.