I'd be really interested to hear how you get on with changing the PCV and if it makes any improvement.
I'm absolutely certain the DPF isn't the root cause. Its very unlikely that oil dilution is a problem given how much fresh oil you are having to add.
Deleting the DPF isn't a good solution for anyone, for one thing its illegal and likely to void your MOT. Also in my view aftermarket remains are not a good idea but that's a bit off topic!
I'm now using about 2 litres in 600 miles so this problem is going to have to get sorted one way or another!
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