250k on the engine. Getting a lot of white smoke. Have just topped up, nominally 1.25 litres in 2250km. Has always used some oil, possibly no less than today, but the heavy smoke is relatively recent. Is this consumption excessive? I think the issue is oil consumption and as far as I can tell the odour is of oil, but a lot of online info mentions injector issues causing the white smoke. It's prevalent under power and particularly if idling, say at traffic lights, then I drive off. Of course it could just be more noticeable then as speed is low, so it hangs around. I tried 20w 50 and this almost eliminated the smoke, but only for around 1,800km. What is likely the next course of action?