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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> Engine Mechanical >> Engine Mechanical - 6.0L (L96 LC8) >> Diagnostic Information and Procedures >> Oil Pressure Diagnosis and Testing

Oil Pressure Diagnosis and Testing

Special Tools

For equivalent regional tools, refer to Special Tools .

  1. With the vehicle on a level surface, run the vehicle for a few minutes. Allow adequate drain down time, 2 - 3 minutes, and measure the oil level.
  2. If required, add the recommended grade engine oil and fill the crankcase until the oil level measures full on the oil level indicator.
  3. Run the engine briefly, 10 - 15 seconds, and verify low or no oil pressure on the vehicle gauge or light.
  4. Listen for a noisy valve train or a knocking noise.
  5. Inspect for the following conditions:
    • Oil diluted by water or glycol antifreeze

      Refer to Coolant in Engine Oil .

    • Foamy oil, which may be caused by a cut or damaged oil pump screen O-ring seal
  6. GM2858286Courtesy of GENERAL MOTORS COMPANY

    Remove the oil pressure sensor (1).

  7. GM2858287Courtesy of GENERAL MOTORS COMPANY

    Install the EN-21867-16  adapter (2) and EN-21867  pressure gauge (1), or equivalent.

  8. Run the engine and measure the engine oil pressure.
  9. Compare the readings to Engine Mechanical Specifications (L20 VIN A) , or Engine Mechanical Specifications (LC8 VIN B) , or Engine Mechanical Specifications (L96 VIN G) .
  10. If the engine oil pressure is below specifications, inspect the engine for 1 or more of the following conditions:
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