184000598 - X05 EXCESSIVE OIL CONSUMPTION

The engine is running smoothly, but the oil consumption is higher than previously recorded during the life of the vehicle.
High consumption during the first few thousand kilometres is considered normal.
Results of the tests
0PRELIMINARY CHECKSAll OKProblems metOperation
Visually check for any leaks which could have caused the high consumptionContinue to Step 1Obvious oil leaksLocate the leaks and eliminate them
1CYLINDER HEAD OIL PENETRATION CHECKAll OKProblems metOperation

Remove the cylinder head and check:

  • That there are no carbon deposits in the combustion chambers and on the inlet valves
  • That the valve stems are not worn
Continue to Step 2Excessive clearance between the valve stem and valve guide and between the valve stem and oil sealReplace the damaged/worn components Op. 1016E10
2ENGINE OIL PENETRATION CHECKAll OKProblems metOperation

Check the piston seals, in particular:

  • that they are not broken or damaged
  • that the actual rings are correctly fitted
  • that there is no seizing or sticking in the grooves
Continue to Step 3Piston seals damaged or seizedReplace pistons, pins and seals
Piston seals not correctly fittedFit the seals correctly
3CYLINDER LINER/BORE CHECKAll OKProblems metOperation

Check:

  • The condition of the surfaces and dimensions (ovality/taper) of the cylinder liners/bores;
  • Piston - liner/bore fitting clearance;
Continue to Step 4Liner/bore surfaces non-compliantGrind the cylinder liners/bores
Dimensions outside of the toleranceGrind the cylinder liners/bores
Fitting clearance incorrectReplace the pistons, pins and seals, following the fitting clearances
4CHECK ON CORRECT OPERATIONAll OKProblems metOperation
Check that the fault is no longer presentEnd of diagnosis