Had my thermostat replaced yesterday (due to no heating and car only warming up to quarter, thermostat had broken inside). Also had oil and filters changed, noticed before the service it had a bit of gunk under the oil filler cap so cleaned off, drove 10 miles to see if heater gets hot and i does now and stays steady at half on the guage, but i still have gunk under oil cap and tiny beads of moisure, i havent really used the car for 2 weeks, only to shops and back, small trips, does anyone have any views on this