Craftsman EZ3 electric start walk behind lawn mower model # 917-377361. Need to know what type of grease or oil is used in the front drive shaft gear case. I only find a 1/4" hole in top of case with plastic plug. I could use a grease gun or oil can to fill.

Sears is no help they will only send mower out to repair center which would cost more than mower is worth, mower is in good shape. Thanks for any help.