Discussion and technical advice the SW20 MR2. 3S-GTE, 3S-GE, 3S-FE etc
Anything and everything to do with maintenance, modifications and electrical is in here for the Mk2.
5w40 is fine, and better than 10w40. Remember that the first number is the thickness when the oil is COLD, so you WANT the thinner 0il at startup. When hot, both oils will be the same viscocity.
the toyota manual was written years ago.