x3 on bad fuel.

I've quickly learned that diesel fuel around my area is HIGHLY variable, even from the same station! I knew gasoline quality sucked out loud, but it has nothing on diesel!

I luckily haven't had fuel bad enough to clog my filters or contaminate the tank with bio crap, but I've gotten fuel with very poor cetane numbers. Car starts rough, idles fairly rough, is LOUD (sounds like a Cummins), and is noticeably down on power. I currently have a crap tank of fuel in it right now, some white-bottle Power Services helps a bit, but isn't a full cure.

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Current stable:
1995 E320 149K (Nancy)
1983 500SL 120K (SLoL)

Black Sheep:
1985 524TD 167K (TotalDumpster™)

Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)