Every one of us in the US with upgraded hpfp's are now having to change the cam follower(c/f) about every 10k miles with a few going either way to 5k and 15k miles between the c/f replacement.
My recommendation is;
If you let it go and never check it, that would be OK as long as you are under warranty and do not mind the shop having your mkv for a few days.
If already past the warranty you should begin checking the c/f.
If you don't, and the cam lobe wears through the c/f, you could be looking at replacing the hpfp, intake cam, and of course the c/f.
Even without an upgraded hpfp the oem hpfp will likely have a c/f wear completely through by 100k miles +/-.
Look at the black diamond like coating(DLC) for wear revealing a polished spot through the DLC revealing the underlying alloy.
Again, once the DLC(black coating on the mating surface) begins to wear through you likely have less than 5 to 7k miles left on it. Trust me on that. I had one looking good and 5800 miles later was completely worn through the c/f and hpfp internal pump rod as well as the intake cams fuel lobe. Luckily it was all covered by warranty except for the additional hpfp upgrade needed which ran me another $900usd.
