Clean out the oil from the Oil Rail T-30 Torx Bolts and ENSURE you have the tool on them correctly, hold steady pressure until they "CRACK" loose. NO IMPACT whatsoever.
To get out one that is stripped, either Dremel it off flush, Cold Chisel it off then remove them all and the oil rail then unscrew the stub with your fingers.
It's not hard and the video above helps tremendously.
Watch/look for the copper crush washer on the tip, clean the seat really well and torque to 28 ft. lbs. Also the Oil Rail bolts are 12 ft. lbs.
Doing mine this weekend. AGAIN!
Denny