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Blue smoke from engine & bad smell

  • 13-01-2008 3:43pm
    Registered Users Posts: 31

    When i change the oil in the diesel engine on my Ford escort 1996 i come to idea to wash the engine from inside, and i mix up some oil with deisel and let the engine run for few minute,after i fill with new oil.Before the engine didn't smoke now is come blue smoke? Could somebody tell me please what is happend with the engine,when it is warm it dosn't come blue smoke.Thanks


  • Registered Users Posts: 3,180 ✭✭✭Interceptor

    Hopefully it is just burning off the lighter diesel/oil mixture which has made it past the piston rings and valve seals - otherwise you have damaged the bores and seals by running it with a sumpfull of not-quite-oil. If the problem lasts for a few days, you have permanently damaged the engine. Where did you get this idea from? How much diesel and oil did you use and how long did you leave it running?


  • Registered Users Posts: 31 solovei72

    Thanks for reply.I let the engine run for cuple 3 max 5 minute.The idea is from one Russian freind hi did on truck engine.And in my case i took the car from one friend for 200 euro, hi was driving the car but did't chnge the oul ,and oil was very thik and dark and i wish to doo the best for engine,washing propely ,and after that is come the probllem,before is not smoke now is smoke.The car has the NCT till next year i wish to drive till is finish the NCT and to skrap yard.When the engine is warm is not so much blue smoke only when you drive on big speed,like overdrive somebodys car oderwise the car is run propely.What do you think to doo next step.Sorry for mistakes

  • Closed Accounts Posts: 2,706 ✭✭✭craichoe

    Sounds like your engine is kaput.

    Running Diesel mixed with oil will change its properties and give the engine almost no protection against wear, expecially when it warms up.

  • Posts: 0 [Deleted User]

    If the blue smoke is from the exhaust its probably a seal or something but if the blue smoke is coming from the engine itself I would try flushing the engine with an oil additive and changing the oil again.

  • Registered Users Posts: 4,616 ✭✭✭milltown

    Flushing is exactly what he did to cause this.
    Diesel contains detergents to remove carbon build up from the combustion chamber. The same carbon build up that was helping to keep your valve guides sealed. By running the detergent in the oil you have washed the helpful carbon away.

    I'd like to give you some good news...

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  • Registered Users Posts: 11,465 ✭✭✭✭cantdecide

    milltown wrote: »
    By running the detergent in the oil you have washed the helpful carbon away

    If this is the case is there a chance it could build up again in time??

  • Registered Users Posts: 4,616 ✭✭✭milltown

    Theoretically it might, but it's equally likely that now it's burning oil he'll have to keep it topped up with fresh oil to the extent that there won't be enough old stuff in there for long enough for this to happen.

    Best bet may be to change the oil for the thickest, most old fashioned stuff the engine will handle. Maybe ask on the classic cars board what the guys are using in old engines.

  • Closed Accounts Posts: 2,300 ✭✭✭nice1franko

    sounds like a smurf stuck up the exhaust

  • Registered Users Posts: 2,817 ✭✭✭Tea drinker

    It might sort itself out, it might just be a buildup of oil in your intake - maybe you overfilled when you put in your mix?
    I don't think you should run the engine with diesel in it - just leave it sit overnight then thoroughly drain, fill with cheap oil, run it, then change to the good oil.
    Did you put the right oil in when you changed it? If you try using 10w50 it might burn less oil - I guess a non zetec escort could live with 10w50.

  • Registered Users Posts: 7,525 ✭✭✭kona

    20w 50 in halfords, very thick. its green too:D

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  • Registered Users Posts: 31 solovei72

    Thanks for quick replay.:)That was the idea to clean the engine propely from inside.And the oil is from halfords 10w40 mineral and i fill normal as i need, i drived last week one full thank and saturday i check the oil level and is the same level,that mean the engine don't eat the oil,i think on saturday to change the oil for more thick, and i will see what is happend after that.:confused:

  • Registered Users Posts: 2,817 ✭✭✭Tea drinker

    See how it goes this week, it might fix itself.
    One question, that's a normal diesel, not turbo? I wouldn't change to 10w50 if it's a turbo.

  • Registered Users Posts: 11,465 ✭✭✭✭cantdecide

    Hands up:eek:- I'm hijacking this thread.

    I was actually going to ask about this myself.

    My A6 has 116k on the clock and is going through a bit of oil but there seems to be no leaks (one of the rocker covers is oozing but that's going to get fixed soon and it's not much anyway) and there is no smoke whatsoever. My mechanic reckon it's not something to be worried about but if i can do something about it...

    A friend works in a motor factors and he looked up his little book and he told me the normal oil listed for the car is 5W30 but there is a listing for 'additional protection' or something like that, as 10W40. I bought 5L of it and was going to change it but I looked at it and it's like treacle and I bottled it.

    Is it too thick for my engine??

    I suppose it's a bad idea to mix different grades by filling with one type and topping up with another??

  • Registered Users Posts: 31 solovei72

    See how it goes this week, it might fix itself.
    One question, that's a normal diesel, not turbo? I wouldn't change to 10w50 if it's a turbo.

    It is a turbo engine,Ok i will think about that.Thanks