Toyota 2008 FJ Cruiser Owner's Manual page 385

Lubrication system
Oil capacity
drain and refill
(Reference)
With filter
Without filter
Oil grade
Recommended oil
viscosity
*: 5W-30 is an oil that provides optimal levels of fuel efficiency.
Oil viscosity
l The 5W portion of the oil viscosity rating indicates the characteristic
of the oil which allows cold startability. Oils with a lower value before
the W allow for easier starting of the engine in cold weather.
l The 30 in 5W-30 indicates the oil viscosity when the oil is at its
operating temperature. An oil with a higher viscosity may be better
suited if the vehicle is operated at high speeds, or under extreme
load condition.
5.5 qt. (5.2 L, 4.6 Imp.qt.)
5.2 qt. (4.9 L, 4.3 Imp.qt.)
ILSAC multigrade engine oil
Use Toyota approved "Toyota Genuine Motor
Oil" or equivalent to satisfy the grade and
viscosity shown below.
Outside temperature
6-1. Specifications
365
6