My year 2000 Focus 2.0 16v is leaking oil, it is quite apparent that it is the yellow lube oil from the air con compressor. As there is no oil that clean or colour, in the engine, gearbox, brake system or power steering.

I have replaced the O rings with the correct green O rings and of the same dimensions. The system refilled. However there is still fluid sitting on the bottom of the compressor, Looking at the prices of a compressor circa £400 Euro car parts, I guess I will be getting one from breakers or similar, can anyone reply if they have had a similar issue, what the problem was due to. I am not aware of any reputable specialists in the Northants area, so if you can help that would be appreciated.

Thank you.