Tuned 2018 GMC Canyon 2.8L Duramax with a DT44 turbo. 98,500mi.
Thoughts on increasing my OCI from 5,000-5,500mi to 6,500mi or more? I've been running Amsoil Max Duty 5W-40 in summer and 5W-30 in winter for about 50k mi. I put a lot of highway miles on the truck, commuting 110 miles per day, 5...