If the old oil was badly contaminated, residue in the system may have contaminated the new oil. If the tractor is stored outside, the fluid could be contaminated with water.
The only way you can tell is to take a sample. Easiest way to do that is to change the filter. You'll get a good sample out of the filter housing, and changing the filter won't hurt a thing.
If the oil is nasty, milky, filthy, change it again.
Now, are you looking to warm the oil to "solve" some issue? What issue? Warming the oil won't hurt a thing, but it should not be necessary. Go ahead if it makes you feel better, but don't do it as a solution to a problem. Fix the problem, or determine that it's a perceived problem (i.e. singing that goes away after a few minutes). The tractor will be more reliable and will last longer.
This post was edited by mkirsch at 09:50:03 12/21/08.
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