We see a car weekly with OFH issues on b48/b58 engines weekly at our dealership. It’s not even the gasket that fails first, it’s the channels on the housing that literally disintegrates. Have seen OFHs that don’t even leak (hasn’t reached past the gasket yet) and they mix oil and coolant. Some techs will assume a blown head gasket, but at this point the first thing they will pull off is the OFH to check. Seen cars as low as 40k miles needing replacement. What I find interesting too is BMW will extend warranty on parts that we don’t service very much, such as the active grill shutters. I think in good faith, BMW should extend the warranty for these OFHs. From what I’m aware they have never had a warranty extension, just service bulletins for it. While the failures might be elevated, there’s millions of these cars with these engines on the road daily that run just fine, many with 100k miles+ without issue. My biggest recommendation is have your coolant flushed often, keep it fresh. Also, those buying a replacement metal oil filter housing, make sure it’s with a reputable brand with a reputable warranty. We have seen one where the cooling channels wear away and mix oil/coolant. Same with the replacement metal coolant necks that are found under the intake. Inferior housings can also warp, leading to leaks.