Quote:
Originally Posted by Captn'J
... Mercruiser installs aluminum or zinc anodes from the factory which is meant for the salt water; magnesium is a much softer metal which is more prone to be eaten away with electrolysis. If you keep the harder metal on for anodes the electrolysis in the water over time will attack your outdrives; using magnesium in fresh water and changing every season will prolong the life of those new B3 drives.
Captn'J
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Exactly, I had some paint peel off a new set of B3's in two seasons. Stopped the peeling dead in it's tracks by changing to magnesium. In the past, Mercury said they will swap new boat anodes to the correct ones for the target waterway for free at delivery.