Letting the tractor warm up in a shed might be the best option. If you use an engine coolant heater, some people add a magnetic heater to the side of the transmission to help warm the hydraulic oil too, and a battery charger to warm up the batteries a little.
I would consider thinning the hydraulic oil with a modern low viscosity hydraulic oil, nothing else. If the hydraulic system is due for a fluid change this would be a good time to drain it all and change to something you can leave in all year (at $15 per gallon this is not an inexpensive option).
How do you use the tractor, and what is your region of the country? Do you use it only for snow removal in below zero F temperatures and only occasionally above 85F or mostly for making hay in 100F temperatures and never below freezing, or something in between those extremes. We are not mind readers.
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Today's Featured Article - Tractor Hydraulics - The Basics - by Curtis Von Fange. Hydraulics was one of the greatest inventions for helping man compound the work he can do. It’s amazing how a little floor jack can lift tons and tons of weight with just the flick of a handle. What’s even more amazing is that all the principals of hydraulic theory can be wrapped up in such a small package. This same package applies to any hydraulic system from the largest bulldozer to the oldest and smallest tractor. This short series will take a look at the basic layout of a simple hydraul
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