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High Oil Consumption/Leaks

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  1. Preliminary Checks

    Check for external engine oil leaks. Check for proper engine oil dipstick. Check for proper oil API rating (CG4/SH) and viscosity. Check air filter minder to see if filter needs to be replaced. Ensure vehicle is not overloaded. Repair any problems as necessary. If no problems are indicated, go to next step.

  2. Verify High Oil Consumption

    Confirm high oil consumption by reviewing vehicle maintenance records. If maintenance records are not available, have vehicle operator log oil consumption for 900 miles. Normal oil consumption rate is one quart or less per 900 miles. If oil consumption rate is within specification, no problem exists. If oil consumption rate is higher than specification, go to next step.

  3. Check For Oil In Fuel

    Remove fuel filter housing cover and check color of fuel. Fuel filter housing is located on top of engine. If fuel is Black in color (engine oil is present in fuel), go to next step. If fuel is not Black in color, go to step  5.

  4. Check Fuel Injector "O" Rings

    Remove each injector and inspect middle "O" ring. See FUEL INJECTORS under FUEL SYSTEMS in appropriate REMOVAL & INSTALLATION article. Replace "O" rings as necessary, and verify repair. If injector "O" rings are okay and oil consumption has been excessive since vehicle was new, replace fuel injectors. If injector "O" rings are okay and oil consumption has not been excessive since vehicle was new, go to next step.

  5. Check Engine Mechanical Components

    Perform TEST 11: CRANKCASE PRESSURE TEST under ENGINE PERFORMANCE DIAGNOSTIC PROCEDURES in SYSTEM & COMPONENT TESTING - 7.3L DIESEL article. If crankcase pressure reading is more than 3 in. H2O, go to next step to check turbocharger mechanical condition. If crankcase pressure reading is 3 in. H2O or less, engine mechanical condition is okay at this time.

  6. Isolate Turbocharger

    Remove air duct at turbocharger compressor housing outlet and repeat TEST 11: CRANKCASE PRESSURE TEST under ENGINE PERFORMANCE DIAGNOSTIC PROCEDURES in SYSTEM & COMPONENT TESTING - 7.3L DIESEL article. If crankcase pressure readings decrease, replace turbocharger and verify repair. If crankcase pressure readings do not decrease, check turbocharger for oil leak. See TURBOCHARGER under OVERHAUL in appropriate article in ENGINES.
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