Im going through the same issue now.
For memebers who havent read the previous posts, il explain it breifly here.
-I try to install boost gauge and in this process i snapped the vacuum line to the boost sensor.
-so i drive the car without the sensor and everything seems fine. No more popping sounds from the exhaust. so i beleive the car is not running rich anymore.
-next day i noticed that the oil temperature is going above 110. Theres steam coming from the radiator. Even with normal driving (barely any boost). Water temperature shows normal though.
-i glued the vacuum line and installed the sensor. But the problem still persists. Very high oil temp, normal water temp. I flusehd and changed the coolant, but no change.
Please help