Join Date: Jun 2002
Location: Point Edward, ON
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I'm not sure when the engineers re-spec'd but the MD2030 I installed new about 10 years ago came with the 3581621. 3581621 is a Volvo part number - not aftermarket so it is the correct filter for the engine now.
I agree with Heartly18 and change the filter annually. I do the filter change at the start of the season with new oil and an oil only change prior to haulout. On the rare seasons where I do get 100 hours on the engine, I do filter and oil at that time in addition to the launch / haulout changes.