Question: What Oil Is Better 10w30 Or 5w30?

Is 5w30 or 10w30 better for winter?

At operating temperatures, both oils will have the same viscosity (30) and will flow and protect identically.

If the oil will be in the engine during winter and you live in a place where it gets cold during these months, use 5w30 oil.

If it will only be in the engine during the summer, use 10w30..

Should you use thicker oil in an older 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.

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.

What is the best oil for old engines?

Castrol Oil Recommended for pre-1980 cars, their multi-grade 20W-50 is formulated with high-quality mineral oils plus selected additives for older technology and classic car engines. Also in the “Classic XL” line is a 30W oil for pre-1950 vintage and classic cars.

Which oil is best for high mileage engines?

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 bad for old engines?

Risks of Using Synthetic Oil in Older Cars This particular combination can be extremely rough on seals within the engine, which can cause the seals to wear down and begin to leak or burn 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.

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.

Is 10w30 better than 5w30?

10w30 is thicker then 5w30 because it has a higher viscosity in low temperatures. The engine oil will flow slower than 5w30 during the cold season. Thicker or higher viscosity metal oil has a better seal compared to low viscosity oil. Thicker oil offers better lubrication of motor and engine parts.

Can I replace 10w30 with 5w30?

Yes. 5w30 and 10w30 are both 30 weight oils and the exact same thickness in your engine when it is at operating temperature. The 5w30 is better because it thickens less when cool or cold. 80% of wear occurs at start up.

When should I switch from 5w30 to 10w30?

If you never see temperatures below zero F then either 5W30 or 10W30 is fine. If winter temperatures are regularly below 0 degrees F then 5W30 is what you should run and you can run it year round if the 30 weight is good according to your owner’s manual. You don’t really need to change to the 10W30.

What happens if you put wrong oil in car?

You might notice a few oil spot in your garage or under your car because using the wrong oil can lead to leaks, or you might become aware of a burning smell while driving. If the oil isn’t working as it should engine parts might not be lubricated well enough and cause friction, which can burn the oil.