We have hydraulic oil going in to the coolant. This machine has a hydraulic oil cooler and a transmission oil cooler built in to the rad. It was pushing oil across 2 yrs ago and we replaced it with an OEM rad. Now its doing it again. Not a cheap repair I might add. Has anyone had this problem? We thought about putting an auxilliary cooler behind the rad or eliminating the cooler all together. Lots of machines don't have hyd oil coolers on them. It's used every day but never continuous and its a little cooler here in Ontario most of the year. About 1500 hours in 2 yrs. Lumber yard so 6-7 days a week. Any thoughts?