Hi I have a freelander 55 plate 06 registered tdi engine. I've had a mechanic put a diagnostic on it and nothing has come up but it's blowing a lot of smoke out of the exhaust he's not sure what to suggest other than stripping the whole engine down it was very low on oil but have since put correct amount in but it seems to have run low again and there's no obvious leak anywhere wondered if anybody else has had something similar as it seems to be running fine ??? Thanks