if your KX 125 is a two stroke (which it most likely is. you can tell by the exhaust pipe coming from the motor. if it is huge, then it's a two stroke)
Two Stroke motors get their oil from the gas you put in the tank. the mix ratio tells how much oil is supposed to be mixed with what amount of gas. you do not check the oil in a two stroke. you just simply add it to the fuel every, i mean EVERY time you fill up.
The recommended type of oil to use for a Kawasaki 610 Mule is API SF. Th610 Mule will hold approximately 1.5 quarts of oil.
There is a site glass on the right rear of the transaxle below the muffler.
Motor Oil
The oil dipstick, on your Kawasaki Mule 610, can be found on the right side of the engine. The top to the oil dipstick should be colored black.
oil plug location
20w 50
3.3 quarts
The oil drain plug, on a Kawasaki Mule Model 2510, is on the bottom of the oil pan. The oil pan is on the lawless part of the engine.
add oil till full
I have a 2007 Mule 4x4 610 and the oil capacity is 1.5 U.S. quarts. (1.4 L.)
i dont know i need to find out
1.5L ( 1.6 US qt )