As Critic said, change the timing belt which will include all rollers and tensioners along with the water pump. Change the engine coolant with each water pump change. Use VW's G-12++ coolant.
As for oil, strongly recommend they use a synthetic 5W-40. The engines are hard on oil and a synthetic deals with the heat much better than mineral based oils.
Personally, I'd do the transmission fluid and filter on a 60,000 mile interval.