How to Choose Engine Oil Standards?

2 Answers
McBeckett
07/25/25 2:11am
Engine oil generally recommends choosing oil with a letter further back in the alphabet. Refer to the vehicle's user manual for recommendations regarding API quality grades. The API grade represents the quality level of engine oil. Taking gasoline engine oil as an example, it is divided into grades such as SM, SL, SJ, SH, SG, and SF. The letters following 'S' are arranged in alphabetical order, with later letters indicating higher grades and better oil quality. Below is relevant information about engines: 1. The meaning of an engine: An engine (Engine) is a machine capable of converting other forms of energy into mechanical energy, including internal combustion engines, external combustion engines (such as Stirling engines, steam engines, etc.), jet engines, electric motors, etc. 2. Classification of engines: They are divided into internal combustion engines, external combustion engines, gas turbines, and jet engines.
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LaKhloe
08/10/25 4:25pm
I often help friends choose cars, and selecting engine oil isn't as mysterious as it seems. First, check the viscosity grade - my wife's grocery-getter runs best on 5W-30, which starts reliably even at -20°C in winter. The key is to look for the API donut symbol; the new SP grade offers 30% better wear protection than old SN oils and prevents low-speed pre-ignition. I've seen owners mistakenly use diesel oil, clogging their catalytic converters in just three months. Remember, more expensive doesn't mean better - my 150,000km old Accord runs smoothly on conventional oil with regular changes. Also, vehicles with particulate filters must use low-ash oil, or you'll face $800+ exhaust repairs.
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