I had excess oil problems on my 2020 V60 D4 cross country just after I bought the car. I rang Volvo, who sent out a mechanic who drained a small amount of oil. He then began talking about regen and PDF filters. As I had just returned to UK after living in South Africa, where I drove only 4x4 diesels, I had no idea what he was talking about. The only problem we had there was using either using 500 PPM sulphur or 50 PPM diesel.
To cut a long story short I found out about redex DPF added to my tank and using premium diesel, I've had no further problems.
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