I use Royal Purple 15-40 in my truck. I change mine every 8-10 thousand even though Royal Purple recommendation was every 12-15 thousand depending on excessive idling, towing etc...
for me I’m comfortable with changing every 8-10 thousand. I’ve got 6,000 miles on this oil change now and the oil is clear that I can still read the lettering on the dipstick through the oil. Used Royal Purple for years and never had any issues.
2016 Ram 3500 4x4 Laramie Cummins, G56, Rough Country Leveling, MM3 EGRless Tuned by Double R Diesel
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