I'm getting ready for the 50 hour service and was having a hard time finding any of the hydro oils listed in my manual.  So, I found the Exxon Mobilefluid 424 at www.use.enco.com for $38 per 2 1/2 gallon jug and free shipping to my door in case someone else is in a similar situation.    I know this isn't dirt cheap but I couldn't find any locally and I think it's good oil.
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