How To Read Oil Container Labels - Toyota Land Cruiser Prado Owner's Manual

6-1. Specifications
The 10W 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.
The 30 in 10W-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 vehi-
cle is operated at high speeds, or under extreme load conditions.

How to read oil container labels:

Either or both API registered marks are added to some oil containers
to help you select the oil you should use.
620
API Service Symbol
Top portion: The oil quality desig-
nation by API (American Petro-
leum Institute) (SN)
Center portion: The SAE viscosity
grade (SAE 10W-30)
Lower portion: "Resource-Con-
serving" means that the oil has
fuel saving and environmental
protection capabilities.
ILSAC Certification Mark
The ILSAC (International Lubri-
cant Standardization
Approval Committee) Certification
Mark is displayed on the front of
the container.
and