The attached document lists some VOLVO to NAPA/FRAM/PUROLATOR etc, numbers for OIL and FUEL filters that are on our MD2030C's. My best source was the CUMMINS Filters site and looking up their numbers for the VOLVOMD2030 (ALL ENGINES) then crossing those numbers to NAPA, FRAM, etc. Hope this helps.
Thats was a good deal of work to go thru.
Let me say this. If you are under warranty, use an OE filter. Why give the enginebuilder an excuse to deny a warranty claim for the $2.00 savings on the oil filter.
Thanks for the reply. Our Lagoon is a 2001. So no warranty issue. Also I would like to know that if I am somewhere I couldn't get an OEM,or the Boat Yard was charging an outrageous price for an OEM, I can get a substitute to get me on my way.