I'm looking at an 861 available locally that's in nice shape. Starts right up, 6V, straight tin, nice paint, good rubber, everything seems to work. The seller changed the oil in October and the tractor has been sitting ever since. I ran it for 1/2 hour with no issues. Gears all sounded good while driving, PTO works and 3 pt. works also. When I looked at it before running first time, oil was clear. I went back to check it again with intent to buy and rechecked everything. This time after I checked, the oil on the dipstick had a light tan color to it. When I ran it, it was about 30° out. Is this something I need to be concerned about? Just wonder if it could be condensate in the oil from warming it up in the cold? Like I say, it seems like a nice tractor and the seller seems like a straight up guy. Anything else I might look at? Or should I take a pass?