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My engine seems to be getting progressively smokier. I noticed it tonight as i was going down the motorway in the dark. under load i get a fair bit of smoke out of the exhaust. it doesn't carry any weight to speak of, the air filter has only done about 3k, no oil or water being used and no mixing of the 2, no loss of power. Also it seems to spunk out a fair bit when i lift off the throttle when cruising about 60mph and as soon as i reapply the throttle lightly it goes away. I can't really tell the colour of the smoke as i'm looking at it through a mirror-through tinted glass-at night but it looks greyish more than black. nothing noticeable at tickover as such
Any ideas what it could be?

Engine is 1X 1.9d non turbo with 193k on it. serviced every 5k
 

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I had a lot of grey/White smoke coming from exhaust and it was down to the timing being off. Replaced timing belt and no more smoke. Just a thought.
 
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