Been using my jd 425 to plow driveway this winter and had not checked the oil in a while so I was surprised to see that the oil was a light milky color and overfilled. I checked my antifreeze reservoir and was a little under low level. The oil on the dip stick was about 3 " over the full mark. Is anti-freeze getting into my oil or water? My oil filler cap does have a crack in it but on the inside the crack does not show so I don't think water could be getting in through there. The tractor is always kept outside but covered, is there anyway condensation could of added that much water in the oil? Has been a little been about 2 years since oil was changed but I always checked it and it was full and the color looked good. Should I just change the oil and filter and see what happens or do I have something major wrong. The day before when I was plowing with the tractor it started to pop and skip like it had water in the gas. It stalled but when I started it back up it ran perfect. I don't know if that was related or not but wanted to mention it. I hope nothing major has happened inside like a blown head gasket or simular any help would be great.