Should the old Corolla use 5w30 or 5w40 engine oil?

[JustinAnn]

The old Corolla should choose 5W30 engine oil. Here are specific methods for selecting engine oil for cars: 1. Performance selection: If you care about the long-term performance of the engine oil, you can choose Mobil engine oil; if you focus on the cleaning effect of the engine oil on the engine, you can use Shell lubricating oil; if you need lubricating oil with strong oil film toughness, it is recommended to use Castrol. 2. Driving conditions: If you often drive in congested areas, the vehicle is older, or for long-distance heavy-load transportation, the viscosity of the lubricating oil can be appropriately increased. 3. Engine type: For naturally aspirated engines, mineral oil and semi-synthetic oil can be used. Compared with naturally aspirated engines, turbocharged engines have a more compact structure and operate in harsher conditions, requiring higher-grade lubricating oil with better fluidity, preferably fully synthetic oil.