I checked the oil in my 05 JD 790, hadn't for a while, and noticed it to be milky in appearance. It was a red oil that was in there (chevron I believe), I had to add oil so I simply put JD LowVis HyGard in when I added my FEL. Could that have made the oil milky? I don't know how moisture could have gotten in there to cause it to happen. Also could it be air from the suction line? I'm going to clean the whole system out regardless, however I'd like some other opinions on the root cause of the problem. I will also mention, the tractor had been sitting for at least a week or two, so I would think that water would have separated during that time. Thanks.