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bigdog · 10-03-2015, 03:30 PM

I have 90hp Johnson outboard 2 stroke.

Silly question....
The gear lube recommneded by Johnson/Envinrude for the lower unit is 85w x90. Would it matter if I refill using a 80wx90 lube, is there that much difference in viscosity?

Also, can I buy auto gear lube same viscosity, at auto parts store or WalMart? The type lube they sell is for automotive though....
Is marine gear lube made differently?

Interestingly, WalMart sells Quicksilver brand gear lube 85wx90, but the label specifically states, for outboards under 75hp ? WT* !
You telling me that there's different grades of gear lube depending on horsepower rating?

When I owned my Mercruiser I/O, I just used normal auto 85wx90 for years without problems.

Thanks for your feedback !

10-03-2015, 03:30 PM	#1
bigdog Senior Member Join Date: Apr 2006 Location: Central MA-Gilford Posts: 1,451 Thanks: 345 Thanked 123 Times in 97 Posts	Gear Lube question ? I have 90hp Johnson outboard 2 stroke. Silly question.... The gear lube recommneded by Johnson/Envinrude for the lower unit is 85w x90. Would it matter if I refill using a 80wx90 lube, is there that much difference in viscosity? Also, can I buy auto gear lube same viscosity, at auto parts store or WalMart? The type lube they sell is for automotive though.... Is marine gear lube made differently? Interestingly, WalMart sells Quicksilver brand gear lube 85wx90, but the label specifically states, for outboards under 75hp ? WT* ! You telling me that there's different grades of gear lube depending on horsepower rating? When I owned my Mercruiser I/O, I just used normal auto 85wx90 for years without problems. Thanks for your feedback !