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MBoater, Remember that a pitted anode just tells you it is working like it's suppose to. The more pitted, the more surface area, the better it works. I would not necessarily replace the anode until it is loosing defined shape. (Manual defines that as 2/3 gone.) A new anode does not guarantee less corrosion. Keeping the bare areas of shaft housing that corrode painted is your best bet. Corrosion on the lower unit can be an indicator of trouble on the horizon. Don't neglect the signs of corrosion. If your lower unit seal fails from prolonged submersion in salt water then you have major issues and a potentially large repair bill. I would suggest checking your gear box oil just to be sure you do not have a bad seal. This is a good idea every year if you leave the motor in the water for extended periods.
I know my DF140 raises out of the water at full up. Only the transom bracket anode is in the water then. Hope this helps.
codfish
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