It takes 4.2 quarts and best way and time to measure oil level is having the car on flat level surface with cold engine (leave it overnight) for all the oil to drip down to the oil pan.
4 quarts
4 quarts
4 quarts
4 quarts
4 quarts
4.2
3.9 but 4 will work just fine
3.9 quarts
From the 2006 Scion xB owners manual (pg 229): Recommended oil viscosity: 5W-30 Oil Capacity: w filter 3.7 Liters / 3.9 quarts / 3.3imp quarts w/o filter 3.4 Liters / 3.6quarts / 3.0 imp. quarts
The 2006 Scion xA typically requires about 4.5 quarts of oil when using an oil filter change. It's always a good idea to consult the owner's manual for the most accurate information regarding oil capacity and specifications.
If you mean how many quarts of oil it's 4 if you're also changing the filter. Less if you're not changing the filter.
A 2009 Scion XB takes 5 quarts of oil to fill the engine and oil filter. It uses standard 5w-20 motor oil for a balance of performance and longevity.