Vader has 57,000 miles and needed to have the lifters replaced
Vader has had about 80 track days plus autocrosses and a little bit of "spirited" street driving. He was to the point where corner workers were mentioning the ticking to me after sessions. I always keep fresh 15W 50 Mobil 1 synthetic in it and keep the level topped to 1 mm above the full level.
When my lifters were replaced, I had my trusted mechanic check for any other issues. Everything else was very good he told me. Compression etc was great. He explained that this is just a natural issue with this motor, and if you expect the motor to perform in the upper rev ranges for most of its life like it does at the track, you just need to accept that the lifters ned to be replaces every so often.