I recently bought a used 2012 X748 with 271 hours on it. When I picked it up the dealer said there was a coolant leak but they tightened up a hose clamp and felt they fixed the problem. Over the next couple days 5 drops of coolant was visible on the deck and dripping off a bolt. The leak then went away. I have now put 4 hours on the machine and can smell anti freeze and once found 3 drops on the deck. I was talking to my neighbor today and he has a 2016 X738 and his has been leaking coolant also. When I lifted the hood he noticed a very slight leak at the top left hand side where the tank is crimped. We then looked at his and sure enough, an identical leak on his much newer machine.
I will call the dealer but want any info regarding if this is an issue with these crimped plastic tanks.