Why does my car burn oil?

Worn valve stem seals, piston rings, turbo seals, or a PCV system fault. Some modern engines (BMW N47, VAG 2.0 TFSI) are known oil burners.

Here's a quick, honest answer from a working UK mechanic — what causes it, what it costs to fix, and what to do next.

Will thicker oil help? — Sometimes yes for older engines, but only use a grade approved for your engine — wrong viscosity damages bearings.

Will burning oil fail the MOT? — Visible smoke or excessive emissions readings will fail.

Bob's Mechanical Repairs — independent family-run garage in Birnam, Dunkeld, Perthshire. Call 01350 727 276 or email bob@bobsmechanicalrepairs.co.uk.