fuel filter particle size

[abnengineering at cs.com]

What is the max allowable particle size for an EFI motor? I've been considering going over to one of the Racor style (used to be Oberg)reusable filters...the smallest screen they have is a 20 micron without going to a paper element. 

As an aside they are marketed as lubrication filters...But I have heard that engines require filtration down to ten microns. What's the max allowable particle size for a standard plain bearing Automobile engine oil system?  I'm considering using a Racor filter for oil as well in tandem with a paper element spin on to extend the useful life of the filter. IIRC one of the on line oil filter comparos stated that some filters start bypassing oil in as little as 18 minutes running time. I figure if I could trap some of the big stuff that the paper element could do the fine particle management and work longer.

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