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UOA: Mercruiser Bravo 3 outdrive oil #5435350 05/21/20 07:07 PM
Joined: Jul 2005
Posts: 37
scotth Offline OP
OP Offline
Joined: Jul 2005
Posts: 37
Not sure this is the correct forum, so I will move it if needed. This UOA is from a Mercruiser Bravo 3 outdrive, ~30 hours on the oil, ~200 hours on the drive. Oil is unknown, boat is new to us. Any comments about the heavy oxidation on the oil and insolubles? Clutch material? There is a chance there is a lot more than 30 hours on the oil since the boat is new to us. But, the port drive UOA came back better.

Last edited by scotth; 05/21/20 07:08 PM.
Re: UOA: Mercruiser Bravo 3 outdrive oil [Re: scotth] #5435657 05/22/20 07:59 AM
Joined: Jun 2005
Posts: 1,386
IndyFan Offline
Joined: Jun 2005
Posts: 1,386
Very interesting! Thanks for posting!

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Re: UOA: Mercruiser Bravo 3 outdrive oil [Re: scotth] #5447902 06/06/20 07:19 PM
Joined: Sep 2012
Posts: 49
biggusblockus Offline
Joined: Sep 2012
Posts: 49
It's a known fact that long, sustained high speed runs are especially hard on B3 outdrive gear lube. If most of the hours are that type of operation, then that might explain the oxidation. Many people install a Shimonek shower on their B3s to help cool them. Simple and effective. Check the paint on your drives, if it is whitish grey and not black, then that is a sign the oil gets hotter than normal.

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