Which oil is better 5w30 or 5w40?

Which oil is better 5w30 or 5w40?

In general, 5w30 is a great multi-grade oil for different temperature specters. It is also more fuel efficient. 5W40 is a motor oil that penetrates to the active mechanisms faster, and provides excellent lubrication on start up.

Is 5w30 and 5w40 the same?

In practice, this means that each oil is just as viscous at lower temperatures and will remain viscous at -30°C, however 5w40 oil outperforms 5w30 oils at higher temperatures, being effective up to ambient temperatures of 50°C, as opposed to 30°C.

Is it OK to use 5W40 instead of 5W30?

There’s not going to be much functional difference between a 5w-30 and 5w-40 as there’s a lot of functional overlap in the recommendations. The lower weight might yield better efficiency under light load operating conditions, but higher weight might yield better protection under higher load operating conditions.

Can I use 5w40 instead of 5w30 for BMW?

Registered. The Castrol oil that BMW used to spec was midway between a 30 and 40 weight. Anything from 0W30 to 5W40 will be fine if it has the LL-98 or LL-01 rating.

Is Castrol Edge 5w40 for diesel?

EDGE Turbo Diesel 5W-40 is suitable for use in automotive diesel and gasoline engines where the manufacturer recommends an API SN/ CF, ACEA C3 or earlier specification lubricant.

Is 5W40 good for diesel engines?

One engine oil for mixed fleet operations Mobil 1 Turbo Diesel Truck 5W-40 engine oil is recommended for use in all super-high-performance diesel applications, including modern low-emission engine designs with Exhaust Gas Recirculation (EGR).

Can I mix 5W40 and 5w30?

Because generally, the answer is yes. Several viscosity grades are compatible and possible to mix, especially when you are low in oil. It won’t cause any adverse effect on your engine. However, you should make sure that they are under one motor oil brand.

Is it OK to mix old and new oil?

3 Answers. Mixing new with the old will cause you absolutely no issues. As long as you are using the same weight oil, it will mix up and you’d never know it. Continue to change your oil at the specified interval and you should be golden.