A small oil leak can make a big mess and can often be difficult to pin down. This 2000 VW Golf VR5 had been suffering from oil loss for quite a while. The long-term leak had developed into a more serious situation and now needed fixing. The problem was that the oil that had been leaking for some time had coated the engine with a thick, black mess. A clean-up was needed before we had a chance of locating the source.
Once things were a little less saturated in oil, we could see fluid was seeping out from below the oil cooler fixing cap. We tried tightening the cap, but this had no effect. Both O-rings had become brittle with age and, once replaced with new supple rubber, the cap could be tightened to seal off the leak.
Years of seeping oil through the cap’s seal had covered the engine in a thick, black mess.