Oil for Duramax Diesel
 

Definitely not restoration, but this is technical.

I don't have a diesel. If I did, I would probably use Shell Rotella T6 full synthetic.
In fact, I have used it in my BMW turbocharged car with outstanding results.

My brother just bought a used Chevy (or GMC... can't recall) with the Duramax Diesel. I know several of you guys have similar trucks. What oil do you like?

I use Amsoil.

https://www.amsoil.com/p/signature-s...oil-15w-40-dme

Amsoil is probably the best that you can get.

I've used Rotella T6 in all of my Duramax's. It's fairly priced, readily available, and does a great job.

Of course, oil threads get highly debated. There was another thread a bit ago about oil change intervals. I myself change at 5000 religiously. Frequent oil change intervals are the absolute cheapest insurance a person has for engine life.

Tim

I put 375k on a 2005 Duramax I ordered new and then sold it to an employee. It is still going. I then purchased a used 2005 with 61k on the clock, it now has 402K. Both always had Amsoil. I use the bypass filter and change oil every 25K. I use the Amsoil in the Allison trans as well.

I use Amsoil as well.

I have used the GM oil in my last 6 Duramax truck.
But I also have GM do the work.
One striped oil pan bolt taught me that
Have always used Rotella in all my Fords.
Never had an oil problem with either
Joe

I use Rotella T6 full synthetic 5W40 year round. Have never had any issues.
Oliver

If it helps anyone considering....

I sign up every year as a preferred customer for $25 and get the preferred pricing. I buy in bulk for all the cars to save a little more and usually wait until they have a free shipping offer too.

Even with the membership fee, and any tax added, it still ends up cheaper per quart (by about $3 a quart) than what the stores get locally for it. It is available locally, our local Napa carries all Amsoil products so if I need something in a pinch I can get it. But I usually try to plan for the year and place one order.

I was an Amsoil dealer for 15 years. I gave it up when I closed my rear end business, but I still use it in my Camaro transmission and rear end. I still believe it's the best oil you can get. I wouldn't have sold it if I didn't believe that.