Originally Posted By: HeavyAssault06
Originally Posted By: A_Harman
I used to run a test at Cummins Engine Co. called the Hot Box Test. This consisted of running at engine at rated power for 200 hours with coolant temperature of 230F. Since Cummins engines use oil to coolant heat exchangers, this meant oil pan temperatures of 265F. Our standard oil for test engines was 15w40 Valvoline Premium Blue (no surprise there!), and we never had a problem with oil oxidation.
WOW....I feel pretty good about using Valvoline Extreme Blue now.
Was this run on all Cummins engines?
Unless there was a special requirement for a different oil in a test, all of the engines in Cummins Tech Center ran Premium Blue. There were 88 test cells there, so we used it by the barrel. I don't know if it's still their standard oil for testing.