[qcj]

Forest, I looked up the amount for the Kohler 20kw gen and with filter the amount is 6.1 qts and I use 15w40. The same as I use in the engine. I also looked in my Detroit Engine Operators' Guide and on page 37 they recommend 15W40 and 40 qts with filter. I always put in about 38 qts and crank the engine let run for awhile then wait for an hour or so then check it again and add what whatever it needs to fill it. Just bought 10 gals.of Delo yesterday and within the next week or so change it. It has been a year since it was changed. Just got finished today changing the lube in the rear end. Five gals. it took of 75W90 synthetic. I tell you these MHs are expensive even it you do your own work. I agree with Tom. Cat said you can put synthetic in the crank case, but you still need to change it at the same time you do reg. oil.