I am never buying Castrol GTX again.
I was in NAPA on Saturday (where I found out my card was declined) talking with the manager about my temp issue in the blairwitch, and ordering a ZJ fan clutch. He asked me what oil I was running, and told him Castrol. He laughed, and asked me if my temp issue started after I started running that oil.
He told me he had a guy about 10 years ago come in with a Jeep looking for a thermostat, as he kept running extremely hot, Jeep only had 5K on it, and was just given an oil change with Castrol. After switching out the oil, the temps in his jeep went back to normal.
So as per his suggestion, I did an oil change and used Valvoline's Durablend, the semisynthetic oil. Low and behold, the temps didn't get as high as on my initial test drive and when I came back up to Boston as they were before, barely getting past 210, when it was running about 225, 230ish before.