Lexus ES300 Owner's Manual page 328

ENGINE
Engine oil selection
"Toyota Genuine Motor Oil" is filled in your Lexus vehicle. Use
Lexus approved "Toyota Genuine Motor Oil" or equivalent to
satisfy the following grade and viscosity.
Oil grade: API grade SL "Energy Conserving" or ILSAC
multigrade engine oil
Recommended viscosity: SAE 5W 30
62Z002
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.
314
Oil identification marks
SOIL11
"API Service Symbol "ILSAC Certification Mark
Either or both API registered marks are added to some oil
containers to help you select the oil you should use.
D The API Service Symbol is located anywhere on the outside
of the container.
The top portion of the label shows the oil quality by API
(American Petroleum Institute) designation such as SL.
The center portion of the label shows the SAE viscosity
grade such as SAE 5W 30. "Energy Conserving", shown
in the lower portion, indicates that the oil has fuel saving
capabilities.
D The ILSAC (International Lubricant Standardization and
Approval Committee) Certification Mark is displayed on the
front of the container.