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it'll get up to a reasonable temperature soon enough. You could deadhead a function to force the oil over a relief. that will warm it up quicker if that is the goal.Because the hydraulic oil is the gear-oil,the whole thing will need to get up to temperature, unless it is like my old deere with a discrete oil resivior.
 

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If the fel doesn’t move AT ALL initially, that means you’re spinning a pump that can’t pull in any fluid, which means you’re sort of running it ‘dry’ (just residual lubrication). If any fluid WERE making it into the pump it would absolutely pump it out and just consume more power in the process due to the fluid viscosity. The only way the loader would ‘not move’ is if nothing makes it IN to the pump. That sounds like a pump longevity issue to me so i would run a thinner fluid. Plus i’d guess when the weather warms up again you won’t notice any downside and end up just leaving it in there year round. My .02.
too think of oil can absolutely be an issue.
very quick googling; The Importance of Hydraulic Fluid Viscosity
"
Low hydraulic fluid viscosity reflects fluid viscosity that is too thin. Thin hydraulic fluid viscosity’s effects include:
  • Increased pump friction due to lack of proper lubrication
  • Increased wear and tear
  • Internal leaks
"

you can research the specific pump's requirements and check the oil temperature and compare what your oil's viscosity is at temperature.

High viscosity index oil is oil that starts thinner and stays thicker as it gets warmer, like a wide ration engine oil.
The problem with high viscosity index oil is that it is full of viscosity modifiers. These are problem because they break down and result in very thin oil. This was a huge issue with the equipment I work on when I initially started with my current job. The oil was breaking down incredibly quick and almost immediately became too thin for the hydraulic pumps. I ended up modifying a cylinder's hydraulic cushion (no where near qualified for that) to allow the machine to work with standard viscosity index thicker oil, and everyone lived happily ever after.
 
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