10W40 oil has a higher viscosity, retaining more thickness than 10W30 as the temperature rises. In that case, 10W-40 motor oil would technically provide better protection against engine wear contact in higher temperatures.29 oct 2021
Is 10W40 good for high mileage?
Designed for high mileage vehicles Mobil 1 High Mileage 10W-40 motor oil is recommended by ExxonMobil for use in high mileage vehicles (even those that have used lower quality conventional oils†), including: Cars. Trucks.
Should you put thicker oil in an older engine?
You should switch to thicker oil if your older car is consuming oil. ... As your engine gets older, the clearances within the engine change due to wear and tear, and your car could start to consume oil. Once your older car starts to consume oil, you should switch to a thicker oil.
Can I use 10W-30 instead of 10W40?
Mixing 10W30 with 10W40 Some say that mixing them is fine as long as you don't live in freezing weather. Even if you put together synthetic and conventional blends of these motor oils, they show no harm to your vehicle. However, this is true only if you mix in a quart of the other type to your usual engine oil.