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low oil pressure

  1. 6.5L Diesel Engine
    i have a 1994 c3500 with the 6.5td and when i start the truck cold it has about 40 psi and when it gets up to temp the oil pressure is about 4-7 at idle!? i bought this truck a month ago and changed oil and filter and used a can or two of lucas to try and fix it and it did temporarily but now my...
  2. Duramax Second Generation: 2004.5-2005 (LLY)
    My oil pressure cold is 45-50 motor is very quiet. Warms up pressure is 25 idle 35 running. Lifters rattle once warned up. Has anyone replaced the oil pump with a high performance pump and got a significant pressure increase. 2005 LLY