How to Differentiate Engine Oil Grades?

[Frederick]

Engine oil grades can be differentiated as follows: 1. From "SA" up to "SL", each subsequent letter indicates improved performance over the previous grade, with more additives to protect the engine. 2. The later the letter in the alphabet, the higher the quality grade. Most international brands offer engine oils above SJ grade. SA is pure mineral oil without additives; SB contains some rust and oxidation inhibitors; SC provides protection against high/low temperature deposits, wear, rust, and corrosion; SD performs better than SC; SE offers enhanced protection against oxidation, rust, corrosion, and high-temperature deposits; SF has better oxidation stability than SE; SG provides superior control over engine deposits, oil oxidation, and engine wear compared to SF; SH has more stringent testing procedures than SG; SJ represents world-class engine oil; SL is an upgraded version of SJ grade.