On Nov 12, 2:46*pm, You wrote:
In article , Martin Baxter
wrote:

Capt John wrote: Using more restrictive filters can
cause problems with your supply pump, or, even worse, cause the engine
to run lean. That will cause the engine to run hot and, over the long
run, cause all kinds of other problems.

Huh? Diesels do not run "lean". *Hint, think about you control
power/speed in a diesel.

Cheers
Martin

Just one of a few of Capt. John's misconceptions......

You need to study up a little, try asking your engine manufacturer
about those filters. The marine specialist at HO Penn, our local Cat
dealer on Long Island, was adamant about this. Said regardless of the
engine manufacturer, they specify the 30 micron filters for a reason.
Your probably more likely to get away with it with a little sail boat
engine than a larger high output engine. For the price of a rebuild,
or replacement, I'll take the manufacturers advice over your's and day
of the week.