My car has recently developed a knocking sound from the engine. I took it in to have it serviced. They reported that it was very low on oil in the engine (very strange as, the car is well maintained and I check the levels often).
The car is running well now after the service – the knocking sound is gone. The mechanic even commented that the car has no leaks and is in very good general condition. The car drives well with no loss of power.
I'm puzzled and concerned can anyone explain the knocking sound and how a car that doesn't seem to leak could have the oil go down suddenly? Is there any danger of long term damage?