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That's what is so strange. I had a diesel mechanic look at it and he thought it was hydraulic fluid as well. The old coolant had a glob on top that had the right viscosity for hydraulic fluid. Maybe the oil interacting with the coolant is causing it to be more viscous. I really can't see...

No I mean hydraulic trans oil. It is definitely not engine oil. It has the distinct smell of hydraulic oil. If it was engine oil I'd look into head gaskets etc..

I have a 12 year old bx2200 which has given me no problems until recently. When I went to do my annual service, I noticed that the coolant looked strange when I looked into it further, it smells like hydraulic oil. Bothe the engine and hydraulic oil levels stay constant. I drained and...