Update:
So after a large amount of research and in preparation for the Clubsport's next service interval, I've done a little shopping.
Penrite 10Tenths Racing 10
10W-40 Full Synthetic engine oil and a K&N High Performance oil filter KNHP-1007. With Autobahn having the weekend sale on oils, I quickly snapped it up.
In regards to the previous service history, the Clubsport had been serviced with Penrite Enrivo Plus 10W-40 with genuine GM oil filters. I will also conduct an oil analysis and filter inspection come service day for a more thorough insight. Current oil pressure is within spec between 30-40psi under normal operating conditions, nothing abnormal at all. I will also check the amount of oil in the catch can.
Quick comparison for any interested parties.
Enviro:
ENVIRO+ 10W-40 (Full Synthetic)
Racing10:
RACING 10W-40 (100% PAO ESTER)
KNHP-1007:
K&N part HP-1007 information
Stay tuned for the analysis and follow up reporting. And feel free to ask any questions.