I bought a 72" D&G International tiller about a year and a half ago. I did not receive a manual with it. Can someone tell me what type of gear oil to use and how much? It appears to have at least two gear boxes to fill. Also, if anyone knows where I can get a manual for this tiller, I would appreciate the advice. It is a model PL 172. Thanks for any help. I always enjoy browsing the discussion forums to see what I might need for my tractor that I didn't even know about! 