Does SF Engine Oil Harm the Engine?

[BethanyMarie]

No harm, but it is recommended not to use this type of oil in winter. More details about SF engine oil are as follows: 1. Introduction 1: 'S' stands for gasoline engine oil, and 'F' represents the grade. From API SA, SB, SC, SE, SF, SG, SH, SJ, SL, SM, to SN, the further the letter after 'S', the higher the oil grade. 2. Introduction 2: Engine oil grades are represented by a combination of two letters. The 'S' series represents gasoline engine oils, generally ranging from SA to SN (in alphabetical order, but without SI). Each subsequent letter indicates better performance, with more additives to protect the engine, and higher quality. International brands mostly offer oils above SF grade. 3. Introduction 3: The 'C' series represents diesel engine oils, from API CA, CB, CC, CD, CE, CF, CF-4, CG-4, to CH-4. The further the letter, the higher the oil grade. If both 'S' and 'C' letters are present, it indicates that the oil is suitable for both gasoline and diesel engines. 4. Introduction 4: Engine oil labels include both grade and viscosity specifications. The label usually indicates viscosity and quality. The viscosity of lubricating oils is often identified by SAE grades, where SAE is the abbreviation for the 'Society of Automotive Engineers' in English.