I acquired a dinghy for our boat last season. This will be the first year I am doing spring maintenance on the outboard motor. It is a Mercury 9.9 two stroke.
Our last boat had Mercruiser bravo 3 out drives and I used Quicksilver High Performance Gear oil in the lower units. Mercury's website recommends Quicksilver Premium Gear OIl 80W90 for outboards under 75 hp. I think the other stuff is 90. I have got a bunch left over from the other boat. Is it OK to use it?
Thanks in advance
Fraser
Lower Unit Gear Oil
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SplashyLady
- Captain
- Posts: 267
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- Vessel Info: Carver 3227 Sedan Convertible
1986 - 260 Mercruisers - Kohler 5E - Location: Lake Norman, NC
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Re: Lower Unit Gear Oil
Yes - either oil will work fine. The high performance stuff is more expensive and has additional additives for higher gear loading. 
Captain John
Past Commodore, Peninsula Yacht Club
Lake Norman, NC
Carver 3227 - "Splashy Lady"
Aquasport 222CCP - "Gone Fission"
Past Commodore, Peninsula Yacht Club
Lake Norman, NC
Carver 3227 - "Splashy Lady"
Aquasport 222CCP - "Gone Fission"
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Viper
- CYO Supporter
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feeez
- Commander
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Re: Lower Unit Gear Oil
thanks Guys.... That was my gut feel but I alway like to check. I also seems the High Perfomance is more available.
Fraser
Fraser
Former 2001 350 Mariner owner
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Viper
- CYO Supporter
- Posts: 6266
- Joined: July 10th, 2015, 9:58 pm
- Vessel Info: 1989 Carver 3807 Aft Cabin
- Location: Ontario, Canada
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Re: Lower Unit Gear Oil
It's been the standard go-to for a while so fewer bother to carry the Premium anymore.
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