The engine didn't seem to mind the extended interval at all. Everything was in check, still additives left in the oil to run it longer. I've switched back to GC for the summer months and warmer temps. I'll run it for 7500 miles and send it in for a analysis for comparison to Edge @ 7500 mi. So far, she seems to be quite healthy at 144k miles!
Interesting the viscosity went up for this sample compared to the last though.
For reference:
130,005 - German Castrol 0w30
135,102 - Castrol Edge 5w30
142,525 - Castrol Edge 5w30
