Sorry, can't help you with the engine number, but B15 should be absolutely no problem. In fact it may help prevent the rod bending because it has higher cetane and burns less violently. The IP o-rings leak when they get old enough regardless of the fuel. If they're fairly new, B15 won't cause them to leak.

As to your CDI B15 should be fine too, but keep in mind MB like other manufacturers only approve of B5, at least here in the US. It might be different in Europe.

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2004 VW Jetta TDI (manual)

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