I used carb cleaner and one type of lube gel that I got from Wal-mart. Only the crossover pipe needs to come off. Remove all the bolts and give it a whack from the front with a rubber mallet if you have trouble removing it.

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2004 VW Jetta TDI (manual)

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