Yeah, my sister had the OFHG leak as well as the VCG leaks. Twice. I did the VCG on our 328i, but surprisingly, the OFHG was fine. My M5 had a remote oil filter housing with lines to it, no issues there. Valve covers also stopped leaking shortly after I started running M1 0w-40, so that was good. Both valve cover breather hoses rotted right off the car though, which was interesting. Never had any cooling system issues with that car, but my sister has had all of them. New rad, her fan exploded, two pressure tanks, coolant sensor leaked...etc.