Which ATF for '04 VW Touareg V10? M1 or 3309

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I have a 2004 Touareg TDI with 97K and the Aisin-Warner 6-spd auto and want to change the lifetime fluid and filter. VW calls for PN G055025A2. The Mobil site says 3309 is the same as well as Toyota IV. I doesn't say M1 is the same but gives a G052025A2 VW number but does say it's compatible with Toyota IV.

So that tells me I can use Toyota IV or Mobil 3309 but can I use M1 when it says it's compatible with Toyota IV but doesn't say it's compatible with the same exact VW part number? Right?

I assume 3309 and T-IV are not synthetic but is that such a bad thing?
 
The OEM fluid is Pentosin (possibly Castrol, though unlikely), actually pretty stout stuff.
 
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