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SA4x4 Clinic got a technical query

Mystery Oil Leak

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Question by: Eugene van der Merwe Answer by: Arnold VenterMy ‘97 Colt 3.0 V6 uses about two litres of oil with every full tank of fuel, but as far as I can tell it’s not smoking or leaking any oil. Where on earth is the oil going, or what am I doing wrong? I use 20W50 as per the manufacturer’s recommendations.
Eugene van der Merwe

THE EXPERT’S OPINION:
A high-mileage Colt 6G72 engine will often show signs of uneven cylinder wear. Once this happens the tolerances between the cylinder wall and the piston ring are too great, causing the engine to burn oil under load or acceleration. Unfortunately, there’s no quick fix for this problem and I can only suggest a complete engine rebuild.
These motors also tend to wear their valve guides unevenly, allowing the engine’s positive crankcase vacuum (PCV) to draw oil past the guides. If the engine smokes under acceleration, it points to worn piston rings and cylinders; if the engine smokes under deceleration it indicates worn valve guides.
Although it may seem like the engine’s burning clean, it’s often difficult to see exhaust smoke in broad daylight. I suggest you ask a friend to drive behind you at night – their headlights should show how much smoke is being produced.
Arnold Venter
CRD (4×4 fitment & repairs)
(011) 907 0580 / arnold@crd.co.za

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