HydroGear factory fill EZT-2200 UOA

Patrick0525

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A 2 year update on the hydrostatic oil analysis.
18g of Redline ZDDP got me to the 1200/1100 ppm Zn/P levels. My calculations were correct.

-0182 Napa 15w-50 added zddp 97hrs
-0078 Factory 20w-50 33hrs
Update: right (182) and left (384) transmission UOA
 

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Does this mean:
- The factory fill in the Zt-3100 is also Castrol 20w50? (synthetic)
- The mystery oil in the Hydrogear service kit is also a Castrol 20w50 synthetic?

Or is the Castrol only in the EZT-s because they are "non serviceable" hence
supposedly never replaced? How do we know what is in the EZT?
 
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Some of the older manuals for Gravely/Ariens indicate the "recommended oil" is the Gravely 00057100 Synthetic, which is
really M-1 15W50. This does not mean that the ZT-3100 comes with that oil fill from the factory.

So now I am really intrigued about the Castrol 20w50 reference. Maybe there is a difference between Hydrogear's preferred factory fill, and the ZT equipment manufacturer's preferred fill.

The Gravely manual does state the factory fill is a 20W50, maybe that is a non-synthetic Castrol or M-1, used as a break-in oil.

Tundraotto, if you have more info on this, please share.
 
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