Being perfectly honest, if you bought a car with an oil leak, chances are the car was put up for sale because of this.

2.5 litres of oil isn't ideal but, like for example when i bought my gold turbo orion, after a couple of weeks my mate said u should check the oil, there was no cause for concern, just out of good practice.

I said to him "nah she used to look after this car it will be fine", in the end i thought fuck it, may aswell check it, DIDNT EVEN REGISTER ON THE FUCKING DIPSTICK The engine ran for ages after though! Its now in cabriolet although i rebuilt it for piece of mind!

You've got to run them seriously low before things get that bad! It was probably on its way out when u bought it..........