Service Rating - This two letter classification identifies the vehicle fuel type and quality level of the motor oil. The first letter indicates the vehicle fuel type that the oil is designed for. The second letter designates the quality level of the motor oil. An SJ oil can be used in any engine requiring an SB, SG, SH, etc. Viscosity Grade - Viscosity is a measure of an oil's thickness, or resistance to flow.
Lower numbers indicate thinner oil and higher numbers indicate thicker oil.
There are two types of motor oils, single grade and multi-grade. SJ Gasoline engines in passenger cars and light duty trucks beginning with 1997 models. Oil designed for this service level provides greater fuel economy, lower volatility and lower phosphorous limits over the previous SH category. SB Minimum Duty Gasoline Service. For engines operating under conditions mild enough to require only minimum protection.