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Blue smoke from the exhaust indicates engine oil is entering the combustion chamber. On start-up, blue smoke usually indicates worn valve stem seals allowing oil to drain past the valves while the engine is stationary. Blue smoke under hard acceleration indicates worn piston rings allowing oil to be drawn from the crankcase. An oil consumption test over 1000 km helps quantify the issue. Valve stem seal replacement is DIY-accessible; piston ring wear requires an engine rebuild.
Based on 284 driver confirmations
Blue smoke specifically when accelerating hard, not at idle. Turbo oil seal had failed — oil being pushed past the seal under boost. Reconditioned turbo fitted. Expensive but the alternative was oil getting into the intercooler and intake which causes more damage over time.
Parts replaced: Reconditioned turbocharger
Blue smoke all the time, getting through oil fast. Before assuming rings or seals checked the PCV valve — completely blocked solid with sludge. Cleaned it out, smoke reduced by 80%. Still slight consumption but manageable. PCV is a 5 minute check and often ignored.
Parts replaced: PCV valve
Blue smoke for about 30 seconds on cold start then clear. Classic valve stem seal symptom — oil drains past the seals overnight and burns off on start. Had the seals done without removing the head using a special tool. £280 all in. Smoke gone completely.
Parts replaced: Valve stem seal set
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