What oil do you run in your Duramax?

[Airmech]

I'll be looking out to see your results. Happy thoughts.

[kyfarmboy]

I also use Shell Rotella in everything , From Semi Truck's to my Harley
Great product , not overprice like Amsoil

[barturo]

mobile 1 5w40 synthetic 06 dually with heavy tow tune

[w2drfg]

2007 silverado 2500hd 116,000 miles. Previous owner used Mobil 1 Turbo Diesel 5w20
I continue to use it and change every 10,000 miles or earlier. Get 16.9 mpg no load.

[Larry Barnhart]

Originally Posted by Larry Barnhart

Mobil 1 synthetic for 05 duramax with 52000 miles.
chevman

Changed to Rotella 5/40 synthetic and now 82000 miles.

chevman

[JustinB]

Mobil 1 Truck Diesel Oil 5W-40
2006 LLY
125k miles

[Tightwadted]

When I bought my 2004 in 2007, (50,000 mi) previous owner had been using Shell Rotella 15w40 I continued that till had injectors redone at 120,000 miles 2 yrs ago (LB7) Chevy dealership put in Delvac 15w40 been running that since, doesn't use oil between changes, getting 18-19 mpg empty, 10-12 pulling 5th wheel. Baldwin filter.

[barturo]

mobile 1 synthetic 5w40 06 cc dually 3500 lbz engine150,000 miles when ever DIC tells me i'm at 0% oil life

[Zac808]

Rotella T 15/40 anywhere from 25%-35% on DIC.

[Gordiegaffer]

I use Amsoil i have over 250000 miles i go 6000 miles do filter change add a qt of oil a than another 6000 its the best stuff i have ever used

[carl.swoyer]

2005 lly duramax running rotella t 5 w 40 $21.00 pr gal and Lucas fuel additive also $21.00 a gallon at rural king in Florida. I have 209 k

[Safrog]

Was using dealer oil during comp. oil changes. Now I will switch to Amsoil. More expensive but I think well worth it. I will also be sending an oil sample for testing every change.

[uncledon]

2002 6.6L DRW CC used specifically for towing fifth wheel trailer. Rotella 15w/40 @ 5000 mile intervals.

[Safrog]

Amsoil.