Just changed my oil for the first time. Used Mobil1 Diesel turbo Truck. Anyone else using this oil. I see a lot of threads about Valvoline etc.
My question mark key won't work on this forum. What's up with that.

 

I'm using it. I noticed that the engine runs a bit smoother with it. I'm probably going to switch to Amsoil AME or HDD at the next change. Another CTD owner I met claims to have gained 1 mpg by going with the 10w30 Amsoil HDD full synthetic oil. The AME oil is a 15w40 full synthetic.

 

I have Amsoil 5w30 HDD in my engine right now and I got .6 mpg increase compared to 15w40 Delvac. I've heard of people get up to 1 mpg when changing both the axles and engine to Amsoil at the same time.

 

anyone run rotela t syn 5w 40?

 

No, but I have some Delo 5W40 to go in for the fall which is about the same level of oil. Rotella Syn is good stuff. Can't go wrong with that.

 

From what I have read Cummins doesn't recommend synthetic oil until after 20k.

I am interested in switching to Mobil/Delvac 1 after break in myself. I am currently using Delvac 1300 15-40. The current info on Mobil's website lists a TBN of 12 for Delvac 1, which is a pretty good number. I would like to see a full analysis of the additive package in Delvac 1 before switching to it. Maybe TDR will break down and test it for us.

 

I just switched to the Mobil 1 Delvac 5w40. I got 10k on the truck. I haven't noticed any real difference. I switch because it still has the old CI-4 rating.

 

Im still running the 15w 40 Rotella...
Works well, smells good, ill keep running it

 

Texan I use rotella syn. I got 6 1gal jugs for $85. First thing I noticed was it wasn't as loud.

 

I went to Rotella Synthetic at 3000 miles. Prepping for the hot Oklahoma summers and the resulting super hot turbo.
Synthetics will not burn or sludge up on the hot bearing like regular oil will.
It quieted the engine down slightly and it seemed to idle smoother.
It's more expensive to use for oil changes at 5000 mile intervals but it will sure protect the engine better at temperature extremes.

 

I had it in my engine for for most of the winter or about about 3600 miles before I dumped it and tried Amsoil 5w30. All I can say about it is my engine runs quieter at all speeds, even better at start up with Amsoil in it then it did when I had Rotella 5w40 synthetic in it.

JMHO

 

I went from rotella 15w-40 to delo 15-40 with a mobil 1 filter and noticed a much smoother, quieter engine. Truck seemed much happier. Even noticed my oil pressure went to 40 psi @ idle.