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Old 01-13-2002, 09:03 PM
Eng Mwr Guy Eng Mwr Guy is offline
Gravely Manufacturer
Join Date: Jan 2001
Location: Appleton, WI
Posts: 249

20W50 is all that is required.

The hydro system runs cool. This will give better life for all components.

In addition the Engineer we deal with at Hydrogear told me that some of the detergents in the synthetic oils is bad for the components inside the pumps/motors. I found that most interesting.

Ariens/Gravely Guy
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