My wife's 2018 crosstrek just had it's high pressure fuel pump replaced due to gas in the oil. A lot of gas was getting in about 1litre in 4000km the car has 15500km on it. She drives very little and mostly city driving. I am concerned with the engine bearings, the dealer said don't worry if there was a problem I would have heard engine noise by now. What is the consensus, she plans to keep the car long term.