Subaru dealer have said my wife's car is broke because she doesn't rag it from time to time, which is cobblers. They've said that if driven with economy in mind then this can cause the problem, they've based this on 2 cars nationally that have this problem, so clearly my wife and this other person (incidentally at the same dealership) must be the ONLY 2 people in the uk that drive their diesel and get 50mpg everyone else doesn't have this problem because they don't drive that way, not sure I but that as an excuse. Also when doing a fluid flush is it usual to strip down the engine to its component parts, seems a bit overkill for an engine flush? Wondering if there's a hidden piston issue which warranted the change to nickel coated pistons that the 2014 car has, my wife's being a 2013 version, hers did burn some oil early on.