Type of oil in 2006 Toyota solara 4 cylinder?

If you check page 301 of your owner's manual you'll discover:

Oil grade:

API grade SL "Energy- Conserving" or

ILSAC multigrade engine oil

Recommended viscosity:

SAE 5W- 30

Outside temperature

SAE 5W- 30 is the best choice for good

fuel economy and good starting in cold

weather.

If SAE 5W- 30 is not available, SAE

10W- 30 may be used. However, it

should be replaced with SAE 5W- 30 at

the next oil change

Not mentioned by the manual is whether standard old dino oil (pumped from the ground) or synthetic (manmade) oils are recommended. The answer depends a lot on the type driving you do and the depth of your bank account. Lots of around town driving, your engine will benefit in a big way from synthetic. Mostly highway use you may see a small mpg increase with synthetic.

Cheers