Alistar;
        Here's a thought; buy one of each, cut them both open and measure
how many square feet of material each on has.
        I ran across a web site where a fellow had done this to dozens of
filters. Not real scientific but still informative.

Good Luck and Drive Safely
Ken Lewis
86 Crewcab, 60 356 T-5
http://Neksiwel.20m.com/

On Fri, 3 Jan 2003 16:43:21 -0800 Alistair Bell <albell@UVIC.CA> writes:
>.... I did it and instead of using my usual choice of a Mann W 719/5
> filter I tried, as a lark, a Mann 719/30 filter.....
> about what makes the 2 year filter different.

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