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Hi

My local marine supply didn't have any of the Mercury lower unit gear lube I typically buy.

Is it OK for me to use 80W-90 gear oil from the auto store? Or is that fundamentally different than the lower unit I am supposed to use.

Merc 5hp manual recommends Quicksilver Premium Blend Gear Lube.

Thanks

jballou
 

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Learning the HARD way...
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I use Super Tech Full Synthetic Gear Lubricant SAE 75w-90 in my Mercury 3.3. It has worked fine for the past 10 years.... But I don't let the engine see the brand on the label.
 
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