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Engine Using Too Much Oil

An engine that needs regular top-ups between services is either leaking oil or burning it through worn valve seals, piston rings, a turbo or a blocked crankcase breather.

High risk

Check the level often and have it checked. Running low on oil can destroy the engine.

Short answer · Why is my engine using so much oil?

Look for leaks first: drips, an oily engine and blue smoke from oil on the exhaust. If there are no leaks, the engine is burning oil; blue smoke from the tailpipe confirms it. Manufacturers state an acceptable consumption, so compare with the owner’s manual.

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Safe checks you can do

  1. Check the level regularlyOn level ground, as the manual describes.If the oil pressure light comes on, stop the engine.
  2. Look for leaksDrips and oily surfaces.
  3. Watch for blue smokeAt start-up or under load.

Questions that narrow it down

  1. Blue smoke at start-up?Valve stem seals.
  2. Blue smoke under load?Piston rings or turbo.
  3. Oily engine bay?External leak.

Possible causes

Listed without ranking. Use the questions above to see which ones fit your car.

  1. Oil leaksGaskets and seals.
  2. Worn valve stem sealsSmoke after standing.
  3. Worn piston ringsSmoke under load.
  4. Turbo sealsOil into intake or exhaust.
  5. Blocked crankcase breatherPressure pushes oil out.

Questions about Engine Using Too Much Oil

How much oil consumption is normal?

It varies by engine; the owner’s manual gives the limit.

Can the wrong oil increase consumption?

Thinner or non-specified oil can.