Noisy valve train. Dealership says that it’s likely that all Boxer engines will eventually sound like Grandma’s Singer sewing machine. No solution offered.
This may help. We looked into the noisy Subbies. Based on my four, yes, they all are noisy. It is the least of your worries! If it is still noisy, it means it is running 
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The car is 4 years old. Valve lash should be checked and adjusted every 30k miles although I’m fully aware that few do this.
Mechanical lifters properly adjusted should have a slight tick sound but they should not rattle.