Same thing with my 2017 spa xc60 D4. Took to Volvo for this very issue. They told me on the phone through service that it's a dilution of the oil due to low mile driving. Had a service and they filled with 5 litres of new oil even though they new I had dilution issue... Two weeks later when the high Oil light came on phoned service again and they realised there mistake and as you say only filled with I believe 4.3 litres. This is there way round the issue. Can't see they calibrate this as maximum though as you would just get the high Oil warning again basically need the oil level between min and max so there is room... for ...the ..fuel. 😂
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