Get the car up to temp and pull off the oil cap (providing its mfi). The engine should stall. If it doesn't stall it may be rings or fueling is out. While its off check for signs of mayo in the cap. for 3 quid you can do a basic check on your car and it will tell you the police, insurance and history of the car. send a text message off your phone to 88600. text CHECK H568 ELT