OK Mr. Anal, how's this: With afterglow, you don't have to preheat your glow plugs as long in order to have a smooth idle, thus saving time (or speeding up the process). Gee....

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2004 VW Jetta TDI (manual)

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