![]() Repairing it is an easy and straightforward job. Over time it wears out and causes the grey-coloured smoke. It reduces the car’s emission as it draws unburnt fuel back from the lower part of the engine back to the top. A faulty PCV (Positive Crankcase Ventilation) valve – This part is responsible for emission control.Besides from being a sign of excess oil burning in your diesel engine, the smoke could also indicate: But there are other reasons why you might start seeing grey coloured smoke. Put simply, when it comes to grey smoke, diesel cars tend to emit it when they lack enough oil. However, truly grey smoke is most frequently caused by burning transmission fluid. ![]() Is it bluish-tinted or is it very light black in colour? Because “grey” is a colour that can be interpreted differently, seeing a cloud of smoke coming out of your exhaust in that shade can mean a lot of things. 4 What to do when you see grey smoke coming from your exhaust pipe? What causes grey smoke from diesel exhaust when accelerating?
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