I've noticed my dad's 445 and my 346xp OE leak bar oil like crazy when they sit for any amount of time. Is this normal or is some seal bad? My dad says he thinks the 445's done it since it was new but I'd like to remedy that if it's possible. The 445 hasn't been abused but I think the 346 had a tree fall on it before I got it if that makes a difference.