I would not worry about using the new CJ-4 rated TDT oil in any diesel engine. It should perform at least as well as the older formula if not better. I also used to be skeptical about the recent shift away from ZDDP anti-wear chemistry, but the new oils are holding up well in the TDI PD engines and those engines are probably as self-destructive as they get. Yes, some additives are reduced, but there's a new generation of cleaner additives that take their place. By all means do a UOA if you're concerned, but I'd at least give the new formulation a try. I know I will if the CI-4+ formula isn't available the next time I do an oil change.

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2004 VW Jetta TDI (manual)

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