My kitchenaid mixer was stored

your oil leaking is cause by a bad gasket or the gasket isn't seated properly. you can purchase this gasket but replacing it does require knowledge of the unit. part number for the gasket is 4162324. the grease can be purchased locally at any car parts dealer. generally a thicker paste type grease is used inside these units, but the original part number for the grease is 4160588 and comes in a container with enough grease for 5-8 mixers.hope this helps

Thanks