Last year, in a rush for IA, I went to Lube Stop and got a Tranny drain 'n fill. I'm in the process of pulling the motor for a swap. When I pulled the driver axle out I thought it smelled like gear oil, so I went into the shed to smell my Fathers gear oil. Yep they smell the same. My paper work says Honda MTF, but I know better then that to think they use OEM fluids. I just assumed they used 10w30. I have put about 15k miles on it since then and hadn't had a problem(knocking on wood). I'll be draining it and flushing the case out but what kind of damage could I be looking at?