buddy just bought an '04 single cab 1500 dodge 5.7 hemi (non MDS), 123k miles. He tends to run his vehicles fairly hard, and its seems that alot of people run GC, T5 10W30 and M1 0W40 in the 5.7s with success. 5 and 10W30 Ultra also seem like a good choice. So, out of THESE oils mentioned above, which would be optimal to use? He has a daily commute of 30 miles each way to work.