i bought my 2009 toro xl440h ride on mower bought ten years ago,it has a hydrogear hydrostatic drive,sealed for life bull#$%* etc,ive changed its oil couple of times by removing the whole thing and upside down draining it from the fill port,bit of a chore,theres no real flat low area to make a proper drain plug fit,even on forums it cant be done?i have a spare unit so opened it up without dissembling the guts and decided I can do it,i simply drilled and chamfered a hole into one of the case bolt holes,added a copper washer and done,itll be a slow drain but better than pulling the entire unit ever again,it only uses 20/50 motor oil in the rear end,takes about 1.8 litres.