Can anyone tell me the exact size of the nut-shaped thing on the oil cap! I made a half-hearted attempt at changing my own oil, and did'nt simply b/c I can't get the damn filter out!! Looks to be at least a 1-1/4" or 1-1/2" socket, but I've not got anything that big in my home toolbox. Lord knows it's probably metric, anyway, any help you guys could offer would be awsome. I'd like to change it before the we start getting snow out here!!