Originally Posted by
WILLYD-MAX
I have used synthetic Rotella,Mobile, and Amsoil in my 05 and dad's 02 and so far I have had the best sucess with Amsoil's 15w40. I just got done putting almost 12,000 miles on an oil change on my 05 and the oil was down on the dipstick mark a little over half. That milage had approx. half trailer pulling miles.
I`m not sure how much oil the duramax holds some say 10 quarts,I`ll know for sure once I get mine.
The Ford 6.0 is 15 qts and Dodge 5.9 is 12 qts
But I would consider suggesting not letting the oil to go below the full mark that much, even if it only takes 16 oz. to bring the level back to the full mark.
How much oil is between the low/hi mark on the Duramax ,I know Ford 6.0 diesel and Cummins is 2 quarts.
And 12 K even with a syn is way beyond miles between changes unless of course you have a oilfilter by-pass system.
You can go a few more miles with using a syn but not that far and being safe with out suggesting the aid of some kind of external oil filtering.
2007.5 GMC Sierra 3500 BLACK SRW C.C. 4X4 LMM/Allison,long bed,Loaded,Westach EGT/Boost pass side, Edge Insight CTS EGT driverside, DIY stock airbox mod, aFe proguard 7 OEM airfilter. Back-up sensors + Back-up camera tied into the navagation screen, Redi Lift leveling kit, Cognito UCA's, Pitman Idler arm support, AMP Power steps, Firestone Air bags with controller in cab.