That sort of usage isn't excessive, if you were eating over 2 litres between services then you would need to start looking at something. Overfilling a 4.2 isn't quite the same, the 3.0 is a very sensitive engine as we all know, while its advised not to overfill a 4.2 will handle it better.
As for the rings, these may not be your only source for the oil usage, you can get a few checks done but at that sort of life I would say that the valve stem seals are also playing a part.





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