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: E92 M3 Sparkling Graphite/Bamboo Beige/6MT. E36 M3 Techno Violet/Dove/5MT. E85 Z4MR Alpine White/Imola Red/6MT