Just got my Blackstone report back the other day as well. I purchased the car in October of 2018 and this is the first time I changed the oil.
I was confused why it stated S63B44 on the report so I e-mailed them and they provided insight to that. I've uploaded their response for everyone's information.
I put around 5,000 miles on the oil and not sure how many miles were put on the oil from the previous owner. But the report came back positive so I was pleased. This was a combination of driving unmodified, stage 1 bootmod3, and stage 2 bootmod3. As well as a combination of Southern California and Washington state climates. I also never needed to add any oil.
I switched to 5W-40 LiquiMoly Leichtlauf High Tech on this oil change and will go 5,000 miles and do another analysis.