US market Volkswagens are all set (or supposed to be set, dealers and those with Ross tech and similar can change it) to fixed intervals of 10,000 miles, Other markets can have variable intervals depending on oil quality. There is some debate about whether the US market cars have the necessary hardware to do the variable intervals although the coding is there in my car, i believe I could set it to variable. As it is - fixed with quality oil works fine.
I understand the Variable intervals can go up to 18,000 miles or so.
There always seems to be a trip coming up and it gets changed a little early because i don't want to exceed the 10,000 right now.