Question: What Is The Best Oil To Use In A High Mileage Car?

Do high mileage cars need thicker oil?

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..

Can I use 20w50 instead of 5w30?

20w50 is actually thicker than 5w30. This will result in less fuel efficiency, less horsepower, and more engine damage because it will have to work harder to rotate. Trust the engineers that made your vehicle.

Is it OK to use full synthetic oil in older cars?

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.

What is the best oil for car with high mileage?

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.

Is synthetic oil better for high mileage cars?

High mileage oil is designed for vehicles with more than 75,000 miles. … This leads to less leakage and oil burn-off, which can be common in older cars. If your vehicle is high-mileage and high performance, it’s suggested that you go with this type of synthetic oil. Not every car requires synthetic or high mileage oil.

Does high mileage oil really make a difference?

High-mileage oils have ingredients to take care of older engines, like conditioners, seal swells, antioxidants, detergents and wear or friction additives. … The higher-mileage oils are formulated with seal conditioners that increase flexibility and restore shape, which can help prevent leaks in the long run.

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?

Considerations. The viscosity level of engine oil 20W50 is geared toward racing engines, as opposed to high-mileage engines, that run extremely hot and need heavy load operation. … Since its viscosity is so great, it can drag down the functioning of the crankshaft, resulting in less horsepower.

Can you put 10w40 in a 5w30 engine?

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.

At what mileage should you start using synthetic oil?

The Correct Change Interval for Synthetic Oil For the vehicles in Car and Driver’s long-term test fleet, those intervals range from 6000 to 16,000 miles (and almost always include oil-filter changes).

What is the best high mileage full synthetic oil?

Best Synthetic Motor Oil ComparisonProductTypeSizeValvoline 0W-20 Full Synthetic Motor Oilfull synthetic5 quartsMobil 1 High Mileage 5W-30 Synthetic Oilfull synthetic5 quartsRoyal Purple SAE 5W-30 High Performance Synthetic Oilfull synthetic5 quartsCastrol EDGE 5W-30 Advanced Full Synthetic Oilfull synthetic5 quarts5 more rows

Is it better to use thicker oil in high mileage engine?

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.

Which oil is thicker 5w30 or 10w40?

A 10w-40 motor oil is a thicker oil at startup than a 5w-30 motor oil. Therefore, 10w-40 oil clings to the engine’s moving parts more than the lower viscosity 5w-30 oil.

Can I mix synthetic and regular oil?

Since motor oils are generally made from the same ingredients (base oil and additives), they are typically compatible when mixed. … Keep in mind that mixing synthetic and conventional oil dilutes the beneficial effects of higher quality synthetic oil.

What happens if I put 10w40 instead of 5w30?

If you use 10-w-40 instead of 5-w-30 specified by the manufacturer then the viscosity of 10-w-40 used by you will be higher and oil thicker than what is specified during winters. Similarly the oil viscosity will be higher and oil thicker than specified during summers.

What is the best 5w30 synthetic oil?

10 Best 5W30 Synthetic Oils – ReviewPennzoil 550022689 (Best Budget) … Liqui Moly 2038 (Best 5W30 Full Synthetic Oil) … Royal Purple ROY51530 (High-Performance) … Valvoline VV955-6PK (Large Quantity) … Mobil 1 94001 (For Nascar) … Castrol 1597B1 (For Extended Performance) … Mag 1 61790-pk6 (Friction Modified)More items…•

Is it bad to put high mileage oil in a low mileage?

It can help reduce oil consumption, smoke, and emissions from older engines. High mileage oil also works to minimize leaks and oil seepage. While you could use high mileage oil in a younger car without harming it, the issues that high mileage oil addresses usually don’t appear in vehicles with fewer than 75,000 miles.

Is high mileage oil worth it Car Talk?

In general terms, high-mileage oil probably costs a bit more than a comparable standard lubricant, but if your car has been around the block a few hundred thousand times, the benefits can be well worth the added expense. For instance, the abovementioned seal conditioners can be surprisingly effective.

What oil is best for older engines?

When you’re choosing the best oil for older cars or high mileage engines, there are several criteria you can look at.Pennzoil High Mileage Conventional Motor Oil. … Castrol GTX Part-Synthetic High Mileage. … Valvoline MaxLife High Mileage Synthetic Blend. … Mobil1 High Mileage Engine Oil. … Amsoil Premium Protection Motor Oil.More items…•

Is 5w30 good for high mileage?

Both high mileage 5w30 and 10w30 engine oils have the same additives, the only difference is the viscosity at cold startups. Since both oils have the same operating temperature viscosity (30) and additives, they will perform exactly the same. However, 5w30 flows much better than 10w30 during cold starts.

Is it safe to put synthetic oil in a high mileage engine?

Because synthetic oil does a better job of cleaning out sludge, it could remove deposits that are acting as seals. … It’s not accurate to say that you should never use synthetic oil in an older car. In fact, Castrol EDGE High Mileage is a synthetic oil designed specifically for high-mileage cars.