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  1. 6.2L Diesel Engine
    I have an M1009 CUCV with 6.2 diesel. When draining the cooling system I noticed what looks to be oil in the coolant. There is no white smoke or liquid coming from the tail pipe and no coolant in the oil. Engine does not run hot so I don't think it is a head gasket problem. The oil cooler lines...
  2. Duramax Sixth Generation: 2017-2019 (L5P)
    I am wondering how many people use synthetic oils versus regular oil in their LP5? I have never used synthetic oil much and I have put 400,000 miles on an 1999 Monte Carlo with Castrol and AC Delco filters and I never opened the motor up. Fuel pump, water pump and a few other bolt on items. I...
  3. 6.5L Diesel Engine
    Hey guys, Got a problem. Had a new injection pump put in my truck. Didn’t go 500 miles and now I have a loud knock, white smoke, and oil coming from the top of the engine. Looks like the oil is coming from a valve cover? Where the turbo connects? No exactly sure. Has anyone had this problem...
  4. Duramax Third Generation: 2006-2007.5 (LBZ & LLY)
    Just changed my oil and found some small bits in the bottom of the oil drain pan. The larger piece is barely magnetic, the other pieces donot seem to be so. How f'ed am I? '06 stock truck with only 77K miles on it. Last oil change was 1 year and 2k miles ago. Truck is primariy used to tow a...
  5. Medium Duty Trucks
    Hey guys new to the forum . I have a crazy question . Just purchased a 2003 c5500 duramax .. pull the hood forward and discovered the Motor has to oil filler caps . one on top and one right center side .. Can anyone explain this ?
  6. Maintenance & Fluids
    Changed my oil for the first time on my new to me used 06 LBZ. I had originally purchased Rotella T6 5w40 in the blue bottle but checked in my owners manual and I notice it "recommended" 15w40 with temps over 0 degrees and above 100 degrees. So went back to Walmart and swapped it out to some...
1-6 of 6 Results