1999-2002 TRX400EX Fourtrax Service Manual, Page 45Get this manual
MAINTENANCE Pourthe recommended oil (page3-9) intothe oiltank pta the upper level mark on the dipstickNOlE: The engine takes about 1.85 liters (1.95 US qt, 1.63 Imp qt) at oil and filter changeBecause only portion of that oil is held in the oil tank, you cannot add the full amount initially
OIL CAPACITY: 1.8 liters (1.9U8 qt, 1.6lmpqtl at draining 1.85 liters (1.95 US qt, 1.631mp qt) at draining filter change 22 liters (2.3 US qt, 1.9 Imp qtl at disassembly
Install the oil filler capldipstickPlace the vehicle on firm level groundStart the engine and let it idle for few minutes without snapping the throttleStop the engine and add the recommended oil up to the upper level mark on the dipstickInstall the filler capldipstickStart the engine and recheck the oil level (page3-91After replacing, make sure there are no oil leaks