Can anyone advise me please I have a Mercedes ML 270 CDI 2002 plate. Last week when I started the engine I noticed grey smoke coming from under the bonnet, when I lifted the bonnet I noted the oil dipstick had been forced out by the smoke causing oil to spurt out. I turned the engine off and opened the oil cap and the same smoke was coming out of there. Engine was running ok at this time. I drove a short distance home (which in hind sight I should not have done) and when I got home oil was spurting out more and now all over the engine. I took it to my local garage and they have told me they suspect the pistons is the cause but they can not get to examine these bacause 3 of the 5 fuel injectors are seized with black tar like substance which I understand to be a common problem in diesel Mercedes. They have advised me to scrap the car or get a new engine as they say despite soaking the injectors they are not freeing up and I will therefore have costly bill to free them before they can even begin to examine the engine. Then if as they suspect the pistons have gone I will need a new engine anyway. Does this add up? Could the seized injectors not be the only cause of this problem or is this likely to be an incidental finding? I have been quoted 2-3k to get everything done and as the car is only worth 3k I am thinking I need to scrap which would be a shame as it has all high spec interior and only just over 100k miles on the clock. I have over the last year spent a fortune on this car with new fuel pipes, diesal pump, full break system. Gutted.