JESSEDIVER49
Senior Member
- Joined
- May 2, 2013
- Messages
- 187
- Location
- USA
- Vessel Name
- Good Vibrations
- Vessel Make
- Grand Banks Classic 42
Sorry if this has been asked already many times. For past 5 years I've been using Ford Lehman recommended straight 30wt oil (Rotella) in my two diesel engines. I am in Houston and rarely is temp below 30 degF. where I shop for oil I see a lot of 10-40 Rotella but no 30 wt. American Diesel says it's OK to use the multi-weight but straight 30wt is preferred because engines will maintain a more steady operating pressure. What do most veteran owners say about this?