Join Date: Jun 2006
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I change annually on my new-to-me diesel, although I'm going from a single Fram filter to a double FilterBoss Racor set-up. On my A4, I just have a spin on Mercury filter element, and before that an AquaPower (I think...blue writing on a white body). I changed that every two years, because it's a busy year if I put 25 hours on the Atomic 4.
One thing, however: if you winterize, drain the fuel system completely by emptying the A4 "sediment cup" (clean the little screen and lube the O-ring), and drain the carb and spray it to avoid corrosion. Remove or drain the fuel/water filter, shut off the fuel line (you have a stopcock prior to the fuel/water filter, right?) and winterize the gas, topping it right up. Keep the filter element in a dry place, inverted and with a greased o-ring.
When it's time to fire up in the spring, reassemble, tighten all clamps and use the primer lever to draw gas down to the carb. It should start, if you've done the usual other winterizing stuff, right up.