From a previous post:
I'm not surprised by the highly variable nature of wear on the follower. My guess is that it depends on a number of factors, and I'll just list a few of the top of my head. 1.) As Schweini stated above the those with the upgraded HPFP are putting at least 30% more force between the cam and follower. That could result in a much greater than 30% wear difference due to the vagaries of hydrodynamic (fluid film) lubrication. 2.) Oil change interval and type of oil could be a factor, although I suspect a small one. 3.) The way the car is driven is likely a big variable. Keep in mind that the pump is activated 1.5 times per revolution of the crank. If you normally drive higher in the RPM range you are putting a lot more cycles on the cam follower that someone that drives like an old lady or someone who short shifts. 4.) Other things that come to mind are trip length, cooling system health, climate you drive in, tracking the car, etc. I'm sure you can think of other factors.
With that my opinion is check/replace as follows:
Stock engine, easy on car - 30K miles
Stock engine, aggressive driver - 25k miles
High performance HPFP, easy on car - 20k miles
High performance HPFP, aggressive driver - 15k miles
It it looks anything like the above picture in post #10 replace immediately
Brillo
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