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My OMC book calls for Ultra-HPF.

But I have lower unit oil that says it is rated for OMC/Yamaha/Merc/ every thing else.

it is 80w/90. Is this OK to use on a 2002 90HP Johnson and a 2005 50hp yamaha?


I want to use what is recommended, but if I don't have to buy new stuff then all the better.
 

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I use synthetic in everything. Much more water resistant properties. I use Bombardier in all my lowers. Honda, OMC, Merc, Volvo, Yamaha whatever.
Capt.Matt
 
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