Castrol 03102 GTX High Mileage 5W-30 Motor Oil is designed to be used in vehicles with over 75,000 miles on them, and yes, it meets a Silerado’s 5W-30 oil viscosity requirements. It does actually also come in a 5W-20 viscosity rating too. This oil comes with several features which benefit high mileage trucks.

What weight oil should I use for high mileage?

Identification. For an older, high-mileage passenger car, it is recommended to switch to a thicker viscosity oil, such as 10W-30, when approaching and passing 100,000 miles, to lubricate the engine well for preservation.

What grade of oil would you use in an engine with high mileage?

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.

Do high mileage cars need thicker oil?

High-mileage oils have ingredients to take care of older engines, like conditioners, seal swells, antioxidants, detergents and wear or friction additives. Typically they use a viscosity modifier that is durable and won't lose viscosity very easily. These oils need to stay thicker longer to protect engine parts.

Related Question what weight oil to use for high mileage

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.

Is 5w30 oil good for high mileage?

Amazon Basics Full Synthetic is the best 5w30 oil for high mileage vehicles. This oil should only be used on vehicles exceeding 75,000 miles. This motor oil is formulated for longer drain intervals. It helps in preventing a build-up on drain intervals and preventing rust and corrosion.

Is 20W50 good for high mileage?

Is 20W50 good for high mileage? 20W50 is not necessarily better than 10W40 for high mileage. If you are asking about needing a thicker oil for high mileage, the answer is no.

Can I use 10w30 instead of 5w30?

Most oils will mix perfectly, provided they have a similar synthetic. Therefore, there is no problem in mixing 10w30 and 5w30 since one will be topping up. Mixing the viscosity of oils will not have any effect on the engine. 5w30 and 10w30 engine oils have close viscosity, and thus there is no harm in mixing them.

Is 10w30 better than 10w40?

Similarly, SAE 10W-40 motor oil performs well in cold weather conditions. It has the same low-temperature limits as the 10W-30 but is better in higher temperatures. Either 10W30 or 10W40 for summer use is fine; however, 10W-40 motor oil will better protect your engine.

Is 10w30 thicker than 10w40?

Engines that run high operating oil temperatures require higher viscosity oil. The difference between 10W-30 and a 10W-40 is the high temperature viscosity. Obviously, a 10W-40 is thicker than a 10W-30 at high temperature.

Do high mileage oils work?

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.

What oil is good for older engines?

Valvoline MaxLife 10W-40 stands out as the best oil for old motors. Valvoline comes with enhanced additives. The additives enable your motor to perform better. It comes with seal conditioners that prevent leaks.

Can I use 0w40 instead of 10w40?

The thinner the oil is for starting a cold engine the better - and that is regardless of ambient temperatures. A 0W-40 oil is a much better alternative than a 10W-40 oil.

Can I use 10w40 instead of 15W40?

A 10W40 oil will be thicker in the cold than 15W40 oil, but they will have the same viscosities at higher temperatures. The winter viscosity number dictates cold-start performance. 10W40 oil will perform cold starts better than 15W40 oil.

Can I use 10W30 instead of 15W40?

High quality 10W-30 oils can perform as well, and better than industry-standard 15W-40 oils. The stated viscosity of a HDEO does not represent an exact viscosity, but rather a viscosity within a range on the SAE viscosity scale.

Can I use SAE 30 instead of 10W30?

Yes, you can make use 10W30 engine oil instead of the SAE30 in your Lawn Mower. Older engines can use the SAE30, while the 10W30 is for modern engines. Again, the SAE30 is better for warmer temperatures while the 10W30 is suitable for varying temperature ranges and also works well in cold weather.

Will thicker oil damage my engine?

Some have even used thicker oil in a leaky engine to prevent oil from seeping out. But really, thicker oil is not good for your engine. Not when “thicker” means higher viscosity than the manufacturer recommends. Your engine was built to specific tolerances - spaces between the moving parts.

What happens if I use 5w40 instead of 5w30?

In practice, this means that each oil is just as viscous at lower temperatures and will remain viscous at -30°C, however 5w40 oil outperforms 5w30 oils at higher temperatures, being effective up to ambient temperatures of 50°C, as opposed to 30°C.

Which oil is thicker 10w40 or 5w30?

Which oil is thicker 5W30 or 10w40? 5w30 is less viscous while 10w40 is more viscous. The 5w30 has a viscosity of 30 at high temperature while a 10w40 has a 40 viscosity at high temperatures. When at high temperatures, the 5w30 oil becomes thinner than the 10w40 oil since 30 is lower as compared to 40.

What happens if you put wrong oil in car?

Using the wrong fluid can cause poor lubrication, overheating, and possibly transmission failure. A mechanic might not be able to reverse the damage, even by flushing the transmission. Mistakenly adding motor oil or brake fluid can also destroy your transmission.

Should I use synthetic oil in my high mileage car?

Myth: Full synthetic oil is not good for high mileage cars or older vehicles. The myth is rooted in the idea that synthetic oil is “slipperier”—lower in viscosity, or not as compatible with seals and will therefore leak or leak more in places conventional oil might not. Again, completely untrue.

Will an engine last longer with synthetic oil?

Since synthetic oil is resistant to breaking down under high temperatures, it will last longer in your engine. Longer lasting oil means that you can go longer between oil changes without doing damage to your engine.

Is high mileage oil better than synthetic?

High mileage oil is designed for vehicles with more than 75,000 miles. Such oil features additives that help protect seals. 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.

What is the difference between 20w 40 and 20w 50?

The main objective of engine oil is to support the engine's smooth performance with proper lubrication and cleaning. 20W40 is suitable for hotter climates and will not cause sludge as opposed to 20w50 which is more appropriate for hotter conditions.

What happens if you put 10W40 instead of 10W30?

As we have just seen, both 10W30 and 10W40 have winter SAE oil grades of 10W. If you were to put 10W40 in an engine designed for 10W30, the “thicker” oil would lead to friction in the engine and an increased load on the oil pump. The car would have to do more work to get the oil around the engine block.

Is 10W30 good for summer?

As a general rule, you'll get the best protection in the summer when you use a slightly thicker grade of oil, such as a 10W30 instead of a 5W30. Engines need a thicker oil in the summer months because of the summer heat and its effects on thinning the oil out.

What happens when you put 10W30 in a 5w20 engine?

Originally Answered: Can I put 10w30 instead of 5w20? You can, but you will get worse mileage, and in most cases shorten the life of your engine, as it will take longer to pump up pressure for your bearings and lifters, and won't spray your lower cylinders for an extra second or so on each cold start.

What is 30 weight oil used for?

Use. SAE 30 oil is typically used for smaller air-cooled engines, like the ones in small tractors, lawnmowers, and chain saws. Most motor oils today are multi-grade oils that will perform well in all seasons.

Which is better 10w30 or 20w40?

20w40 is thicker at high temperatures than 10w30 It is desirable for lubrication at operating temperatures to be high. 20w40 is better than 10w30 at normal operating conditions.

How do I know what weight oil to use?

For example, a 5W- motor oil will flow better at lower temperatures than a 15W- motor oil. The higher number, following the “w” refers to hot weather viscosity, or how fluid your oil is at hot temperatures. The higher the number, the thicker the oil at a specified temperature. Is thicker oil better?

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