Was tinkering around, trying to locate a small oil leak the car has only when the engine is on, suggesting components that the oil reaches when its pressurised.
I found out what it was, it's seeping from this plug thing on the oil filter housing. Can this be tighten? How can I fix this?
The problem is caused by a poor choice of material for the 'O' ring that seals the cap (covering the thermostat for the oil cooler).
The kit has an 'O' ring in an improved material and shape, a new cap to fit it, and a new snap ring to hold it in.