d-max oil

[JRZ2500HD]

what weight oil should i run in 03 d-max/ally

[Roofer]

15-40 oil, made specifically for diesels. I use Rotella 15-40 and Napa filters. Part number 7202 on the filter.

[BlackSilver]

Use 15W-40 stamped to meet SAE -CI or -CH specs for diesel engines. Shell Rotella is an excellent brand which you can get at most NAPA or similar stores. DON'T let some "Quickie Oil Change" place touch your Duramax. They generally don't have a clue.