Ahhh,, and, Hello Homies: I stumbled onto this site and forum rather incidentally, , after I googled Low Growling on 2018 Crosstrek:: I own a 2018 Subaru Crosstrek; sitting right at 45,000 miles.. Just today I elected to look furthing into my car's issue and upon Jack-Standing the rear axles - I will very likely discover the 'rear' wheel bearings are in need of replacement.. Do it ye-self thing: after watching the U-Tube video on 'bolt-in' rear subaru wheel/axle bearings,, I am thankful at this time and place that RUST is not an issue to replace the bearing on my vehicle... less than 200 dollars for parts and perhaps another 45-50K... time will tell.. Also,, in Florida and my driving is basically paved asphalt roadways.. Nice to compare Notes!! @ Peace.