Decal says: Service Air Cleaner Daily Donaldson Air Cleaner MORE FREQUENTLY UNDER SEVERE DUST CONDITIONS CLEAN AND REFILL OIL CUP TO OIL LEVEL BEAD WITH- S.A.E. 10 OIL IN FREEZING WEATHER S.A.E. 30 OIL IN WARM WEATHER S.A.E. 40 OIL IN EXTREME HOT WEATHER
