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Best Gear Oil?

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TXFlyGuy

Well-Known Member
Joined
Apr 25, 2012
Messages
2,972
Location
Republic of Texas
After learning of two incidents of prop governor failure due to contamination from the PSRU, what is the best gear lube?

On AutoPSRU.com, they strongly recommend 85-140 mineral oil (GL-5) saying this is the only proven oil to run quiet, smooth and cool, without foaming issues.

All of the Autoflight New Zealand PSRU's (Titan Mustangs) run Valvoline 75-90 Syn Oil. And the manufacturer says this is suitable.

I noticed some foaming in my oil lines, and my gearbox has a noticeable high pitched "whine". Enough that it got my attention. And I have the 75-90 Syn Oil in my gearbox.
 
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