I hope this is still allowed!

My wife has a 2007 Beetle convertible with 100k km (60k miles). It's a 2.5L 5 cylinder with the six speed auto transmission. It never came with an owners manual. Does anyone know the service interval for oil changes? My 2013 Golf is 15k km so I assume the same? We use synthetic. 

Also is anyone familiar with transmission issues for Beetles. I was reading that valve bodies I think might fail. Mine is starting to shift rough and I was hoping a fluid change might help. It's likely original fluid. 

Thanks
Jeff

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