Hi Mr. Simon, and welcome aboard. We'll need some details of your machine (and let's face it, we all like that kind of information anyway, that's why we're here). Please start a new thread in Ride-On Mowers and give us the model number and serial number (under the seat or wherever they are on that model), engine number (on the cooling air cowl if it is Briggs & Stratton), and if possible a photo or two. Tell us where the oil is coming out, and under what circumstances.