When must car engine oil be changed based on its color?

1 Answers
StGemma
07/29/25 2:21pm
Car engine oil must be replaced when it turns deep black. Below are specific methods for selecting engine oil: 1. Performance selection: If you prioritize the long-term effectiveness of the oil, you can choose Mobil oil; if you focus on the oil's ability to clean the engine, Shell lubricants can be used; for lubricants with strong oil film toughness, Castrol is recommended. 2. Driving conditions: For frequent driving in congested areas, older vehicles, or long-distance heavy-load transportation, the viscosity of the lubricant can be appropriately increased. 3. Engine type: For naturally aspirated engines, mineral oil or semi-synthetic oil can be used. Compared to naturally aspirated engines, turbocharged engines have a more compact structure and operate under harsher conditions, requiring higher-grade lubricants with better fluidity, preferably fully synthetic oil.
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