Should Audi A3 use 5w40 or 5w30?

[VonCody]

Audi A3 typically adopts turbocharging technology with relatively larger clearances, making 5w-40 a better choice. The specific differences between 5w30 and 5w40 engine oils are as follows: Different viscosity: 5W-30 and 5w-40 oils have different viscosities, with 40 being higher, meaning 40 consumes more fuel. Different performance at low temperatures: 5w-30 performs better in low-temperature conditions. This is because the viscosity of 5w-30 is significantly better than that of 5w-40 under low temperatures. Different performance at high temperatures: Under high-temperature conditions, 5-40 offers better stability.