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Old 03-22-2022, 05:42 PM   #8
Senior Member
Brand: Thor Motor Coach
Model: Tuscany 42GX
State: Missouri
Posts: 1,152
THOR #9178
Cat additive or fork oil are the best I have found. Marvel mystery might help but not always. One of the benefits of the additives is reducing the popping when a jack leaks down a small amount.

Mercon V or any synthetic automotive transmission oil is fine. Used it for many units and years.
lwmcguir is offline   Reply With Quote
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