Go with 5w20 check oil levels every 3 gas fills, make sure the oil is in between the two marks on the dipstick. Change oil every 3k-5k miles. Different opinions come from different drivers, your oil usage will vary, check it often and you'll be good. It only takes 5 min.
Stop by rx8club.com and introduce yourself, it's the unofficial rx8 forums.
Stop by rx8club.com and introduce yourself, it's the unofficial rx8 forums.