126. If level is low, add only enough oil to raise level to filleropening.Note: Check the oil each time the mower is used or afterevery 5 operating hours. Initially, change oil after the first 8hours of operation; thereafter, change oil after every 50hours of operation. More frequent oil changes arerequired in dusty or dirty conditions.Filling the Fuel TankImportant Never use methanol, gasoline containingmethanol, gasoline containing more than 10% ethanol,gasoline additives, premium gasoline, or white gas becauseengine fuel system damage could result.1. Clean around the fuel tank cap and remove the cap fromthe tank (Fig. 7).1Figure 71. Fuel tank cap2. Using unleaded gasoline, fill the fuel tank no higherthan to bottom of the filter screen. Do not over fill thetank.3. Install the fuel tank cap and wipe up any spilledgasoline.DangerIn certain conditions, gasoline is extremelyflammable and highly explosive. A fire orexplosion from gasoline can burn you and othersand can damage property.• Fill the fuel tank outdoors, in an open area,when the engine is cold. Wipe up any gasolinethat spills.• Do not fill the fuel tank completely full. Addgasoline to the fuel tank until the level is 1 in.(25 mm) below the bottom of the filler neck.This empty space in the tank allows gasoline toexpand.• Never smoke when handling gasoline, and stayaway from an open flame or where gasolinefumes may be ignited by a spark.• Store gasoline in an approved container andkeep it out of the reach of children. Never buymore than a 30-day supply of gasoline.• Always place gasoline containers on the groundaway from your vehicle before filling.• Do not fill gasoline containers inside a vehicle oron a truck or trailer bed because interiorcarpets or plastic truck bed liners may insulatethe container and slow the loss of any staticcharge.• When practical, remove gas-powered equipmentfrom the truck or trailer and refuel theequipment with its wheels on the ground.• If this is not possible, then refuel suchequipment on a truck or trailer from a portablecontainer, rather than from a gasoline dispensernozzle.• If a gasoline dispenser nozzle must be used, keepthe nozzle in contact with the rim of the fueltank or container opening at all times untilfueling is complete.