Thanks guys for clearing up my fuel cycle question. The collapsed filter seems to be the last of my algae. On a new prefilter I haven't seen a speck and I've been driving it now about 2 weeks with no change. I've run a little biodiesel and a couple gallons of Powerservice over the winter. Maybe that's what cleaned me up.

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'82 240D, 215,000 +
Classic White, Regenbogen