My opinion on fuel filters. Take it for what it is worth, not much. I try to change my filters every year unless I have performance issues. Filters are put there to catch trash that gets in the tank from dirty fuel. If you always get clean fuel you don't need to change the filter. If you get dirty fuel the day after you change the filter, then you will have to change it again.
The engine will tell you when to change the filter.

PaullM

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84 500 SEL (307,xxx miles)