Hi just recently bought a 2011 te511 the guy I bought it from said he hadn't changed the oil since last year(it was sitting in his garage) I got it home started to change the oil and the oil drain plug was in there super tight, when I finally got it off I realized he over torqued it and stripped the aluminum threads on the case. I took it to the shop and they ran a tap down through it and the bolt started fine but when I got it home oil was leaking from the drain bolt now, so I took it back then he said I just needed a new crush washer so I got one put on took it home and about an hour later it was leaking again! Just wondering if anyone has had anything similar happen and knows a way to fix this thanks!