That thread is very instructive thank you. I am not sure that with 125k miles on the clock and 13 years of age it will be worth stripping the engine to replace oil control rings though. What puzzles me is the drop in fuel consumption; I would not have expected that if only oil control rings have worn. Fuel consumption has never been good, an overall average of 34 is the best I have achieved. Even sitting at 60mph on a long motorway run will not get me to 40mpg. I will see what the Volvo specialist diagnostics reveals.
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