Hi, thanks for the quick reply. I checked under the oil filler cap, there is a bit of oil on it, but nothing milky in colour. I can't see any bubbles on the dipstick either, although the car is not yet cold so I will check again then. Just to clarify on your second point. I will wait until the car is cold, take off the radiator cap and start the engine and will check for bubbles. Should I top up the radiator and replace the cap whilst the car is running? Also, is it ok at this stage to just put tap water into the radiator or should I buy the green coolant