UK Car Repair Questions? Ask a Mechanic for Answers ASAP
Oil issues are typically oil getting past the rings into the combustion chamber, you should see bluish smoke at least on startup. What happens usually is that the ring grooves get coked up with burnt or solidified oil residue, and the rings are not able to seat properly.
Or your PCV system may be pulling oil through, which in turn would end up with it burning off as well- though you would see signs of it in the intake pipes.
How much coolant are you going through? Typically as soon as the weather temps start to drop in the fall you will see the level drop a bit.
Well, the PCV valve is mounted to the valve cover on the intake side of the motor. Typically, if the valve in it fails, it will suck hard on the crankcase area- so trying to take the oil cap off with the engine running will be difficult, it will suck down hard. It's a common failure point and was the subject of a recall in the US on the 2.0T engines
1l in 1000km is right at the limit of the spec for oil consumption (sounds like a lot to be "normal" i know)