Which Is Better 10w30 Or 20w40?

Will thicker oil damage my engine?

Not only that, but the engine will waste energy pumping the thicker motor oil, reducing fuel economy.

Since thicker oils don’t transfer heat as well as thinner oils, operating temperatures will increase, too, possibly leading to accelerated chemical break down and harmful sludge and deposits..

Is 20w50 good for high mileage?

20w50 isn’t going to kill it. It’s an old school pushrod engine and probably getting pretty sloppy with that many miles on it. However, it DOES need to be checked out to find out WHY it’s using that much oil.

Which is better 10w40 or 20w40?

A 20 W 40 oil can replace a 10 W 40 if your winter /cold temperatures are not too low. A 10W 40 will affordbetter lubrication and performance over a wider temperaturerange than a 20W 40 oil. So for 10W40 oil, when yourengine is cool it will have a 10 grade viscosity.

Which is better 10w30 or 20w50?

But what’s really important is that you use the oil viscosity the owner’s manual recommends. … So, 10W30 oil has less viscosity (flows easier) when cold and hot than does 20W50. Once the engine is running, the oil heats up.

What is 20w40 oil used for?

Multigrade oils (like your 20X40)are formulated to pass viscosity tests across a range of weights. For example, 20W40 meets the requirements for 20-weight at cold temperatures and 40-weight at high temps.

What happens if you put 10w30 instead of 0w20?

If your vehicle requires 0W-20 weight oil and you use as much heavier weight 10W-30 the oil will not flow quickly enough to fill the spaces between the crank journals and main bearings while the engine is running. The oil won’t form a consistent lubricating film, allowing metal-to-metal contact and wear.

Is 10w40 good for high mileage?

A: Yes. This is a practical method to improve oil pressure in an older, high-mileage engine. The slightly thicker oil film from the heavier base weight oil — 10W — can help protect worn engine bearings as well.

Is 10w40 good for summer?

Using 10w40 oil in the summer will help the oil stick to internal components in high temperatures, avoiding the wear and tear from metal-to-metal contact between moving parts.

Is 10w30 good for high mileage?

Mobil Clean High Mileage 10W-30 is designed for vehicles with more than 75,000 miles. Its advanced formulation helps protect seals and prolong engine life. … These oils protect against sludge and engine rust and corrosion under high and low-temperature operating conditions.

Should you use thicker oil with high mileage cars?

High-mileage motor oil doesn’t hurt and it could prevent leaks from starting. … Some mechanics recommend switching to a thicker (higher viscosity) oil — such as 10W-30 full synthetic oil instead of 5W-20 full synthetic — or using oil additives to stop leaks.

What is 20w 50 oil used for?

A SAE 20W-50 motor oil is typically used in older vehicles or in particularly warm climates. Castrol GTX 20W-50 has been specially formulated to help extend the life of your engine by keeping it free from sludge, even when operating in extremely high temperatures.

Is it OK to mix 10w30 and 20w50?

If you mix viscosity grades such as a 10W30 low-viscosity oil and a 20W50 higher-viscosity oil, it is reasonable to expect that the resulting product will have viscosity characteristics which are thicker than the 10W30, but thinner than the 20W50.