Tony
Assuming it is a four stroke engine, it uses a monograde sae 30 engine oil. made by Briggs and Stratton, but can be used in any air cooled 4 stroke engine. and can be got at most mower repair shops. try not to use multigrade motor vehicle oil as the engine will prematurely wear
Feel free to ask any further questions
Regards,
Ben
[This message has been edited by Ben G (edited 14 April 2002).]