You need to monitor and record exactly how much oil you are actually puting in over how many kilometres. Armed with that data. my suggestion would be to drop the oil, change the filter and refill it with Nulon 5W40 Euro Spec. Then after 1000 k's take a sample of the oil and send it to Nulon for testing. They will then give you an independent laboratory's report on what they find. Your local Nulon outlet should be able to help with the test kit and the cost, which is quite reasonable. We carry out this process on the race car engines after every 10 to 12 hours of running.
In addition I would have your local workshop carry out a leak down test which will confirm if there is any weakness in the piston rings sealing. If that proves not to be the reason for the oil consumption then I'd be looking for an external reason for the usage, leaking turbo seal, blocked PCV valve etc.
Cheers
Gary
Golf Mk7.5 R, Volvo S60 Polestar, Skyline R32GTST
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