OIL DILUTION SWITCH There is an oil dilution switch on the instrument panel on all models up to the N. On the N it is below and to the right of the instrument panel. When outside temperature is below freezing, dilute the oil before stopping the engine. Run the engine at 1000 rpm and hold the dilution switch ON for at least 4 minutes or until the oil pressure drops to 15 psi. Do not dilute unless the oil temperature is below 50'. Fill the oil tank by removing the fuselage cover between the firewall and the windshield.

The oil level is determined by a rivet that passes through the filler neck of the oil tank. If the engine is cold, fill the tank to about 3 inches below the rivet; if the engine is hot, fill the tank right up to the rivet. Never attempt climbs of 60' or more, or dives of 90', unless your oil tank is filled to at least % of maximum capacity. OIL OVERHEATING If the oil temperature rises above 85' when you are cruising, open the coolant shutters all the way, reduce the power, and dive the airplane slightly. Don't dive faster than 250 mph with your shutters open. Return to the field and land if the temperature stays high. If the oil overheats when you are climbing, open the cowl shutters and level off. Reduce the power and start a slight dive with the shutters open. If that does not help, go back to the field and land.