I tried 5.5 quarts of this oil in my 1998 Audi A4 with 2.8 V6, 30-valve engine with 160,000 miles. With this Ultra oil I often (maybe 1/2 the time) get valve chatter for about 1-2 seconds on cold or warm startups, even now in a garage where it's 70F overnight.
The chattering is common in these engines when certain oils are used, but I have not ever heard it for several years. Before this I'd been using Lubro-moly 0w40 or Motul VW/Audi Specific 5w40. My oil changes are always at 5,000 miles, with a Mann filter. The engine uses maybe 1/4 quart during the 5,000 miles, and has never had major work - just the routine cam seals replaced every 50,000 miles or so. As the subject says I'm not impressed - Ultra seems inferior to other oils that cost less (online).