Free: Contests & Raffles.
lot of folks around here are switching to shaffer's oilbit expensive but they say the engine gets quieter with the moly in the oil it coats all the parts in the engine and it runs smoother/quieter. I might do it, I advanced the timing on my engine a little bit so it might help http://www.schaefferoil.com/I was quoted about $500 for a complete lube change out to synthetic schaeffer's oil - including the T-case and both diff's with moly oil. The auto trans would also be changed but that wouldn't be the moly stuff obviously.
Polarbear, if your rig starts fine when plugged in then your glow plug system isn't working. Do some googling on checking and replacing your glow plug relay. Also do some checking on the top end oil change. It's not a closed system, it's the same oil you see in the pan circulating through the reservoir.
My '07 Cummins used 12qts and I changed it between 7500 and 10,000 miles. My '11 Duramax uses 10 qts and I change it by the oil life monitor. Usually approaching 10,000 milesThe Cummins and Duramax are both very easy on engine oil and will run a long time with whatever 15w-40 you want to run.
Duramax, 10 qts of Amsoil. I change the filter every 6-7k and all the oil at 12-14k
1999 F350 400,000 miles. Changed the oil every 15k. Castrol. Checked the bearing journals at 300,000. There was only 1/10,000 of an inch of wear. Not a speck of sludge or carbon in the engine. I have a 2012 F450 6.7. I use AMsoil in it. Change it every 20K. I put Amsoil in the transmission also. Pulling my boat is a 38,000 lb load. Transmission only heats up 2-5 degrees. 10 Tons of hay and a 7500 lb trailer in the summer, Excelerating up white pass ,no heating up of the transmission and only about 10-15 degrees in the engine. If I had it to do over again I would have used Amsoil in my 99. But I am not unhappy with 400k on the engine. It runs as strong as the day I bought it. I made a New Mexico Trip in November. 35 hours each way. 75 MPH did not burn adrop of oil. At 400K it is still amazing.