I just bought a LifeLike Proto-N GP20 and have been running it for the first time today. I growls somewhat loudly when it enters a turn. Along the straight track, no more noise than any other diesel, but in the turns it growls more loudly than it's running mate, another LL GP20. It also slightly slows down when entering the turn too...not a whole lot, the slow down is barely noticable. I added a very small amount of oil to the gearing as it really seemed very dry. (I don't know exactly how long this diesel sat on the store shelf.) I checked the wheels with a gauge, and they're lined up straight and set according to the NMRA standard N gauge. I've never had an engine be this noisy in a turn like this...anyone out there seen this?