After seeing all the failures over the years and knowing my own strict regimen has kept mine in my 2010 robust and trouble free.....
I'd highly recommend a much more brisk interval than 30k.
Me personally, I do mine 2x per year, regardless of mileage. Once in the Spring, once in the Fall.
Now granted, that may be extreme for some, but I'd HIGHLY recommend performing the PTU service AT LEAST once per year.
Regardless of mileage.
The mere peanuts it costs in fluid, and the less than 30min time to perform it, makes it an absolute no brainer.