Brackish water and flushing an outboard
Way back when (pre1960's) the outboards could use flushing. With current outboards flushing is not required. Can't hurt, but doesn't do much good. Side note, please don't grease bolts unless done annually. The grease dries out over time and little by little, the aluminum threads cut into the case can come out with the harder stainless bolt threads.
Just keep fresh fuel/oil and ensure lower unit has clean lube with good seals and any of the big name makes of outboard will give you decades of dependable service.
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