[jason3317]

I typically use a 30 micron primary and engine mounted 10 micron secondary with no problem. Last year, I got a free supply of 10 micron 12S? Racor filters...which I used with no problem.

If Yanmar specifiied 10 micron as the OEM filter, then I see no reason to go smaller. The times when I am banging around sloshing up crap in the tank is the exact time I do not want to be changing unnecessarily small filters that got prematurely clogged.

I also think 3 inline filters (three!) is unnecessary.

 

[jason3317]

Ok.. I've a racor 220 that uses a 24t element (10m) should I get a 120 and install that after it? EVERYone has 2m filters right? sounds like something worth doing?
ps: never had a probl with 10m filter.

If you add another Racor, it should likely match the 220 you already have. Cost difference is small, and the filters are interchangable, so you don't have to carry two sizes.