Aluminum anodes are more active than zinc anodes and suitable for Mercruiser outdrives that operate in salt, brackish or fresh water. Since 2001, all Mercruiser outdrives with stainless steel propellers were delivered with aluminum anodes.

Which Anodes Should I Use — Zinc, Aluminum or Magnesium?

  • For Mercruiser boats with no AC shore power connections, or having AC shore power connections with galvanic isolation, use Chart Merc-B (pdf).

Mil-Spec Aluminum

Outdrive Corrosion
Ouch! Don't let this happen.
Click to enlarge.
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