Quick Answer: Is There A Big Difference Between 5w30 And 5w40?

Can I go from 5w30 to 10w40?

Your vehicle does not use 5W-30 oil.

The recommended oil viscosity for your vehicle, according to Kia documentation, is 10W-40.

If you drive the vehicle in exceptionally cold weather, well below 32 degrees, you can use 5W-30 oil but even 10W-40 is still perfectly OK to use if outdoor temperatures are below freezing..

Is it OK to put synthetic oil in an old car?

Myth: Full synthetic oil is not good for high mileage cars or older vehicles. … Synthetic oils will enhance the engine protection in older vehicles with higher mileage, just as they do for new engines.

Is 5w30 good for old cars?

In general thinner oils flow faster and lubricate better, and keep the engine parts cooler. using a thicker oil is asking for trouble. So if your original specification calls for 5W30, I wouldn’t change it. … Your driving habit also affect engine performance.

What happens if I use 5w 20 instead of 5w 30?

Due to the increased resistance of the thicker 5W-30 oil, your engine will produce slightly lower fuel economy and horsepower output. You also risk engine damage when using 5W-30 instead of 5W-20, as the internal engine components are specifically designed to be used with 5W-20 motor oil.

Is 5w20 good for high mileage?

Generally, you should use the oil that is recommended in your manual. If the manufacturer recommend 5W20 — you should stick with it. … Finally, some manufacturer have “High Mileage” grade oil. These are said to have additional additive specifically formulated to help engine with over 75,000 miles.

Is 5w30 good for summer?

It used to be that changing oil weight for summer or winter months was part of proper maintenance. … To combat this, a lightweight oil such as 10-weight was used for cold weather, so it would flow, while heavier 30- or 40-weight oils were best in summer months to prevent the oil from breaking down in the heat.

Which oil is best for high mileage cars?

5 Best Motor Oils for High Mileage Engines#1 – Mobile 1 High Mileage Synthetic Oil.#2 – Royal Purple HMX Synthetic Oil.#3 – Mobile Super High Mileage Synthetic Oil.#4 – Castrol GTX High Mileage Synthetic Blend Oil.#5 – Pennzoil High Mileage Synthetic Blend Motor Oil.

What cars use 5w40 oil?

5W-40 motor oil. The 5W-40 viscosity is a prevalent recommendation for performance engines in European vehicles with gas-powered engines, and in American diesel pickup trucks.

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 there a big difference between 5w20 and 5w30?

The key difference between 5W20 and 5W30 motor oil is that the former is thicker or less viscous. … The more viscous motor oil is, the better it will be able to resist the heat and not break down. In this case, 5w30 oil will provide better overall engine protection than 5w20.

Is 5w30 better than 10w40?

The main difference between the 5w30 and 10w40 is the viscosity difference at different temperatures. … The one, 5w30, will be able to flow better when the temperatures are low than the 10w40. So at a lower temperature, the 5w30 oil will be the best to protect the engine.

What happens if you put the wrong oil in your car?

The brand of motor oil matters little, but its viscosity grade (10W-30, for example) is important. Use only what the owner’s manual specifies. Using the wrong oil can lead to reduced lubrication and shorter engine life. If the manual says to use synthetic oil, do so.

What happens if I mix 5w20 and 5w30?

You can mix a 5W20 with a 5W30 oil with minimal amount of issues provided it the same manufacturer and the same API classification. … I would suggest just getting the oil changed.

Can 5w40 be used instead of 5w30?

Takeaway. If you are racking your brain to choose between 5w30 and 5w40, we recommend you go with 5w30. However, if it is too expensive or not available for use, you can always go with the 5w40, which is just as good and will not cause any damage to the engine parts.

Which is better 5w30 or 5w40?

Viscosity This term is defined as how well the liquid will flow through the engine. The working viscosity of 5w30 is basically from 9.3 to 12.5mm2/s whereas the operating viscosity of 5w40 is 12.5 to 16.3mm2/s. That means 5w40 has larger viscosity than 5w30. So, 5w30 is better than 5w40.

Is 5w30 good for high mileage?

1. Valvoline 5w30 – Editor’s Choice Best Synthetic Blend High Mileage Oil. … Having a large market share also allows Valvoline to cater to all niches, but we think that this is the best all-around motor oil for a high mileage engine that we saw. That is why the Valvoline 5w30 is our Editor’s Choice best high mileage oil.

Can I replace 5w30 with 10w40?

When you change the viscosity of your oil, you will be gaining an advantage for some engine parts to the detriment of some other parts. I would not recommend going to a 10w-40 unless the engine had an oil consumption problem or was used exclusively in a high load application in hot ambient temperatures.

Is Thicker oil better for high mileage cars?

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 5w40 good for summer?

5w30 oil is designed to operate at temperatures as low as -25°C, but is also a great choice for warmer climates that reach up to 25°C.

Should I put synthetic oil in my old car?

It’s not accurate to say that you should never use a synthetic oil in an older car. If the car has been maintained and is in excellent running condition, the synthetic oil may protect the vehicle and prolong its life.

What is the best car oil?

Our Top Picks for Motor OilBest Oil for Most Cars: Mobil 1 Synthetic Motor Oil.Best Synthetic Oil on a Budget: AmazonBasics Full Synthetic Motor Oil.Best High-Mileage Oil: Valvoline High Mileage Max Life.Best Conventional Oil: Valvoline Daily Protection.