ATP-205 has worked for me (F-450), but nothing lasts forever. Maxlife has helped with the XJ in my sig, a lot, it's slowed down enough that it doesn't even drip anymore.
Not to State the obvious but your oil level is correct right ? Many VW owners had RMS leaks and they took their oil level down slightly , like a quarter of a quart and it stopped , I saw it for myself with my friends 2 year old VW . 2 years later and not a drip .