A clio I might be buying has a bit of an oil leak and I just wanted to see what could be the possible causes. The leak comes from the back of the engine somewhere and you can see oil across the length of the sump which has come from the back of the engine.
The possibilities I know of are:
Oil Pressure Sensor (I think that's what it's called)
Sump Plug
Core Plug
Head Gasket
Are there any other possibilities (or common possibilities anyway) that I have not mentioned.
I don't think it will be the sump plug as the car had been sitting for two months but there was still a lot of oil left in it (about half way between min and max on the dipstick) whereas when it had been running he went through about 5 litres of oil in a period o two months.
If it was the oil pressure sensor, would that affect the operation of the oil pressure gauge on the dash?
Thanks.