This really should be a 1-reply thread because the question is very simple. Here's the answer...

Use any C-rated oil with one of the following viscosities: 5W-40, 15W-40, 5W-50, 15W-50.

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2004 VW Jetta TDI (manual)

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