Scion recommends 0W-20 oil for low temperature climates, and 5W-20 for moderate and warm climates. We broke all the rules and used 5W-30; it is easier to find and better than 5W-20 for especially hot conditions.

We know you don't want to do math, so here's some math help! If you are using a handy-dandy 5 liter jug of motor oil, you will be left with just under .8 quarts in the bottle.