- Jul 16, 2019
- The ATL
I run 10w-30 in my 2019. I've got over 11,000 miles of towing, and 28,000 miles total with no problems.
I run a 2012 Cummins Ram here in Iowa and use 15W40 year round. Fuel dilution can be a problem in the winter months and bio-diesel doesn't help either. Starting with a higher viscosity gives me comfort. If it's in the manual to use 5W40 or 15W40 then why not use it? I find it is easier to get these viscosity's than 10W30 HDEO.
If it's good enough for the semi's on the road it should work for my truck...
You do realize that all OTR OE manufacturers, Paccar, Freightliner, Navistar, Mack & Volvo, have been using 10w30 as factory fill for 5-8 years, right?