Sent my sample to Blackstone yesterday. 6500 miles on Liqui Moly 10W60 (had to change oil slightly early due to long roadtrip coming up), no top up in between. Will keep you guys updated.
Current: 2008 BMW M3 Sparkling Graphite/Bamboo Beige/6MT. 1999 BMW M3 Techno Violet/Dove/5MT. On the list: BMW M2 Long Beach Blue/Black/6MT