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Discussion Starter · #1 ·
I guess my question isn't specific to my outboard...but that's what I'm doing the gear lube change on.

I have used Yamaha Gear lube exclusively in my outboard but, the only places that sell the stuff around me are only open while I'm at work. I've been doing some reading online and have heard good things about Starbrite Synthetic, Mobile 1, and Royal Purple and was wondering if some of the experts around here could give me their professional opinion on one of these more easily accessible gear lube options.

Thanks fellas!
 

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To be honest you can use regular 90wt from any auto parts store.
but it's like anything else you have a good, better, and best. Marine grade gear lubes are deigned to emulsify water and suspend it. Where as non marine LU oil isn't, so if you use something other than a marine grade I would recommend changing the LU oil frequently.

I use Mercury high performance gear oil in all my outboards, (except my F350 Yamaha) I also run it in my rear ends on my trucks. It's really good stuff!
 

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If you are referring to their Synthetic Blend High Viscosity 80W 90 yes you can run it in. Don't know if they make a full Synthetic LU oil.

Don't have much info on it as I don't use it, but its a marine grade gear case oil so you should be fine.

If you make the switch to the blend, buy some extra and once the LU has drained pump from the top with the bottom screw out to flush the non Synthetic blend out.

Then proceed to fill from the bottom like your suppose to! ;)
 

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Discussion Starter · #6 ·
I run into the same issue with Merc high performance...the places around me that carry it are closed before I leave work. I ordered some Starbrite Synthetic from Amazon today. I'm usually all about using manufacturer's products (I use exclusively Yamalube 2 stroke oil) but I'm sure this will be more than adequate.

Thanks for the opinions guys!
 

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Hey rkmurphy also keep in mind that all your Quick silver products are the same as mercury which are sold at retailers like Wally world, Academy, West marine, etc etc!
 

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Discussion Starter · #9 ·
Hey rkmurphy also keep in mind that all your Quick silver products are the same as mercury which are sold at retailers like Wally world, Academy, West marine, etc etc!
Dang it...oh well. Next lube change then haha
 
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