I just went thru this and the Mobil 1 filter I was given as a cross reference is M1-303. It appears the same as the Mercury filter I pulled off, gasket in same position, and the center threads are the same as it spins right onto the filter head. Are there that many filters that cross reference? This will be the third Mobil 1 filter part # in this thread.

To update this post and thread with cross reference info, I did a little research and spoke with tech support for Mobil 1 oil filters. As someone before mentioned, the M1-302 is the common Chevy oil filter and will work just fine. The M1-303 that I was pointed in the direction of(via cross reference at Autozone of all places) is a little better oil filter than the M1-302 according to Mobil 1 tech support line. I did a cursory check and it appears the M1-303 will work fine in replacement of the Mercury Racing filter...gasket in same position, same threaded mount.

Here is the tech info on the 2 filters according to Mobil 1 tech.
M1-302... 3.77 diameter, 4.53" length, 13/16" thread mount, no anti drain valve internal
M1-303.... 3.68 diameter, 5.38" length, 13/16" thread mount, includes anti drain valve internal

The tech I spoke with recommended the M1-303 over the M1-302 for a remote mounted oil filter in this application. That's good enough for me.

The M1-302 and M1-303 both have anti drainback valves.

The 302 does not have an internal bypass relief valve and 303 does.

never ever ever use anything but OEM oil filters.Especially when you are dealing with a 10 dollar part, have seen the aftermarket fail.

What OEM filter are you referencing? I've not seen the Mercury filter part # 35-881126K01 for $10. Where have you?

Merc does not make their filters and they are an inferior part compared to many on the list. Merc filters are a $5 part with a $10 label.
Plenty of data has been posted before that shows flow and filtration ratings.

http://m.ebay.com/sch/i.html?_nkw=35...p=35-881126k01

With all of my respect ( as you are very respectible with your knowledge) i have seen " better" filters fail. But never a filter specified from the origin of the engine's recomendation

$15.95 +shipping is cheapest I see from that link.

Nothing disappoints me more than seeing a high-dollar boat engine with a FRAM filter on it.