Question: Can High Mileage Oil Damage An Engine?

Why is high mileage oil bad?

High mileage oils contain seal conditioners and additives that cause o-rings, gaskets and seals to swell.

In some cases, older valve-guide seals in engines may have reduced seepage.

This can result in lower oil consumption..

Which oil is best for high mileage engines?

Valvoline High Mileage with MaxLife Technology. … Castrol Edge High Mileage. … Mobil 1 High Mileage. … AmazonBasics High Mileage Motor Oil. … Pennzoil High Mileage Motor Oil. … Lucas Oil High Mileage Oil Stabilizer. … Royal Purple HMX High Mileage Synthetic Motor Oil.

When should you start putting high mileage oil in your car?

The first is to switch when your vehicle reaches 75,000 miles. The second is to switch if your older vehicle is beginning to show signs of engine loosening. If you notice an oil drip, that’s a sign you should start using high-mileage engine oil.

How often should you change high mileage oil?

The quick-lube chains usually recommend it be done every three months or 3,000 miles, but many mechanics would tell you that such frequent changes are overkill. Indeed, most car owner’s manuals recommend changing out the oil less frequently, usually after 5,000 or 7,500 miles.

Is it bad to change your oil too often?

Why frequent oil changes aren’t actually better Over 60,000 miles of driving, that would be 20 oil changes, compared to 12 oil changes if you followed your manual’s recommended 5,000-mile intervals. … But experts say that too frequent oil changes won’t make your car last longer or run better.

How long does oil last in a car not driven?

six months“While synthetic generally holds up better and can serve for more miles, it is equally important to not extend oil changes beyond the time interval recommended by the manufacturer—typically six months or a year if it is a motor that is not driven many miles or on many short trips.”

Do high mileage engines need thicker oil?

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.

Does high mileage make a difference?

In general, buying a higher mileage newer is better than buying an older car with less miles. … On top of that, cars are meant to be driven so cars with higher mileage tend to last longer because car tends of lubricate itself more often and burns carbon build up which are all helpful for a long lasting engine.

Should I use high mileage oil or synthetic?

As a rule of thumb, most new cars require synthetic oil. Older cars generally run well with conventional oil, unless your vehicle has more than 75,000 miles on it, in which case high-mileage oil is recommended.

Is it better to change your oil before or after a long trip?

If your current oil has already been in the vehicle for several thousand miles and is dirty brown on the dipstick, though, you’re better off having the oil change performed before the trip.

Is 5w30 good for high mileage?

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 does high mileage oil do?

High mileage oil works like a powerful multivitamin, restoring worn engine parts and preventing further wear and tear. As the seal conditioners within high mileage oil expand and rejuvenate seals, less oil seeps out from your engine.

What is the difference between high mileage oil and full synthetic oil?

In this respect, synthetic oil is far superior. Conventional oils will thicken in cold weather and thin out when very hot, while the viscosity of synthetic is much more uniform. … High Mileage Oil: Vehicles are lasting longer, and more than 2/3 of the cars on the road have more than 75,000 miles on them.

Is it OK to use high mileage oil in a new car?

Zhang said “it’s really good for high-mileage engines… for when vehicle performance is deteriorating,” but it can be used in brand-new cars as well. Added anti-wear and detergent compounds are just as helpful in a factory-fresh vehicle as they are in one that’s got 75,000 miles on the clock.