Anyone test this?

[Cat320]

My owner's manual had four categories...here is each and it's oil change interval:

Severe Service: 25k

Short Haul: 35k

Long Haul: 50k

RV: 35k

It might be buried in the verbiage, but I did not see an explanation for the four categories.

[mleeder]

This is all I’ve ever used in my 2017 F450. I use a Royal Purple oil filter and change every 10,000 miles.