Hi, I am a ownwer of a 1.8 "v" plate freelander. Today i was on the motorway when slowly the pwer started to die, so i pulled into the service and put some oil as not much was showi9ng. i carried on with my journey and it was ok but then i started loosing pwer again and so grey smoke was pouring out the back! the RAC didnt know what it was so i was towed back home. Any ideas what this could be as it doesn't seem to be overheating or anything?