PRESUME THIS IS A PETROL ENGINE.
OIL FILTER IS LOCATED ON THE FRONT OF THE ENGINE TO THE RIGHT SIDE AS YOU LOOK AT IT, LOCATED IN A BLACK PLASTIC HOUSING WITH A HEX NUT ON THE TOP. SCREW THIS ANTICLOCKWISE TO REMOVE, REPLACE CARTRIDGE FILTER AND RUBBER SEAL.SCREW IT BACK DOWN BUT DO NOT OVERTIGHTEN.
DAVE U, March 2009