Universal M-18 Engine Maintenance

Recommended Maintenance Schedule

Recommended service intervals for the Universal M-18 engine
Service ProcedureRecommended Service Interval(s)
Replace engine oil & oil filter100 hours / 12 months under normal operating conditions
Replace fuel filter400 hours
Replace air filter element1 year
Cleaning heat exchanger500 hours

Service Part Numbers

Service part numbers for the Universal M-18 engine
Engine oil filter Fram PH3593A (opens in new tab)
Engine air filter
Fuel filter Wix 33390 (opens in new tab)
Engine V-belt Old Alternator Bracket: Gates 7410 V-Belt (opens in new tab)
New Alternator Bracket: Gates 7390 V-Belt (opens in new tab)
Glow plug NGK (2031) Y103V (opens in new tab)
Thermostat
Radiator cap Duralast 7013 (opens in new tab)
Raw water impeller Sherwood: Sherwood 10077K-SHW (opens in new tab)
Oberdorfer: Impeller 6593, Gasket 6599, O-ring 9797-03 (opens in new tab)

Fluid Specs and Capacities

Oil & Fluid Specs

Oil and fluid specifications for the Universal M-18
FluidGradeProduct
Engine oil SAE-30 HD Rotella T1 SAE 30 (opens in new tab)
10W-40 HD Castrol GTX 10W-40 (opens in new tab)
Engine coolant Prestone 50/50 Prediluted (opens in new tab)
Transmission fluid Valvoline DEX/MERC ATF (opens in new tab)

Fluid Capacities

Fluid capacities are nominal — always fill to proper level on dipstick or to fill plug level as applicable.

Fluid capacities for the Universal M-18
SystemCapacity
Engine oil2.5–3.0 quarts w/oil filter
Cooling system3.0 quarts
Transmission10.0 fl. oz.