Hydrostatic systems aren't as picky about what kind of oil they use as what some folks would think. As an example, Danfoss approves a wide range of oils for use in their pumps and motors including various grades of engine and hydraulic oils, ATF, universal tractor fluid, and various bio oils. The important thing is that the viscosity stays in the correct range over the entire operating temperature range. If you don't operate your machine in extremely cold conditions a more viscous oil should not be a problem. You might put a gauge on your case drain line - if the pressure stays below 50 or 60 psi during cold starts and gets down to no more than 20 psi or so when warmed up your shaft seal will be fine.
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Today's Featured Article - Talk of the Town: Best Tractor? - by Staff. This recent discussion on the Tractor Talk discussion board here at the on-line magazine drew quite a bit of response. We see the question of "Which tractor is best for me?" asked quite often. We thought you might find the responses interesting. As always, the names of the people participating in the discussion have been left out - we did not request their permission to reprint their names in this article. However you can find this discussion in it's entirety in the Tractor Talk archives.
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