Forum Discussion

Kidoo's avatar
Kidoo
Explorer
Oct 14, 2014

Synthetic Oil - Do you use it in Cummins Engine?

Anyone did switched to synthetic oil? I wonder if there is any bad effect to switching to synthetic oil on a 2003 Cummins. My engine book says we can do it. I would like to put 10W40 year long. It ...
Class A
ScottG's avatar
ScottG
Nomad
Oct 15, 2014
Kidoo wrote:
The 10w40 synthetic rotella T6 here cost 104.00$ for 5 gallons, the 15W40 Diesel cost 83$. For the difference I would go for synthetic.

But I never tried this engine in very cold weather with 15w40, I know my Ford needs the 0W40 to be sure it will start in the minus 30 temp.


Me too and I can go a year or more between 5000 mile changes so that's really not that much more money in the long run.

About Motorhome Group

38,705 PostsLatest Activity: Jan 23, 2025