I did the 315,xxxx service recently on our TW II VRX AWD.

I did get Mal to do a 3.8 upgrade for the 270,xxx service, but all the ancilliaries are still the same, and it burns more oil than the 3.5 did, which was more or less nil.

Other than the 3.8, I've done nothing more than routine servicing, and I doubt it'd be any different if I'd kept the original 3.5. The 3.8 is a nice upgrade though, better fuel consumption and noticably improved performance.