Different years take different amounts. Put 8.5 qts in with a fresh filter then add as necessary.
There was a discussion years ago suggesting to use the recommended oil manufacturer and weight because the oil manufacturer's blend is specific to the auto manufacturer's specs. (suppliers, producers, etc. bid on those auto contracts).I have a 2003 SRT 10. 10W-30 Mobil 1 is recommended. The newer Vipers use 0W-40. I plan to use 5W-40 synthetic in my 03. Is there any reason that I shouldn't?