Some people have reported that it's really great at getting rid of fungus in the fuel tank. I've tried one bottle and I can't say that I noticed any difference in anything though I didn't have any fungus problems. Personally I like Amsoil's Cetane Boost and Diesel Fuel Additive Concentrate the most.

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2004 VW Jetta TDI (manual)

Past MB's: '96 E300D, '83 240D, '82 300D, '87 300D, '87 420SEL