It doesn't make sense for a manufacturer to go out and test every every oil out there to see which one performs to specifications. They come up with one oil that's tested and certified for the equipment and that's what they support and recommend. That doesn't mean that any other oil will not work, it just means that it's never been officially tested in the equipment and so you use it at your own risk. If you're ok taking that risk for $20-$30 savings, no problem. I myself use Mystik JT5 in my tractors instead of HyTran.
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