Top 8 Best Oil for High Mileage Chevy 350 in 2023

One of the most important and vital aspect for vehicle maintenance of your Chevy is that to choose the best oil for high mileage Chevy 350. Making one wrong decision can and will shorten the span of your vehicle life.

To assist you in selecting the finest oil, we have created a list that includes the top oil for Chevy 350.

These Chevy 350 oil will have additives that will assist older engines to stay lubricated longer and maintain their seals. Most significantly, the best high mileage oil lowers the engine's likelihood of oil sludge formation.

As a consequence, the lifespan of your engine will be increased, and you will be able to get many more kilometers out of your automobile or truck. You will even notice much improvement in the performance of your vehicle.

Best Oil For High Mileage Chevy 350: Quick Comparison

Top 8 Best Oil for High Mileage Chevy 350 Engine:

1. Castrol GTX High Mileage 10W-40 Motor Oil

Vehicles change as they age, and some of these changes might necessitate costly repairs or replacement. Castrol GTX High Mileage is considered as recommended oil for Chevy 350.

It is specially formulated with less phosphorus than other leading oils, replacing it with advanced Castrol technology invented and patented that helps prevent catalytic converter and emission system failure.

It also delivers unrivaled protection against sludge, wear. Oil burn-off vs. leading conventional oils, 5W-30 tested.

Catalytic converter failure is one of the most prevalent and expensive issues encountered by high-mileage automobiles. The phosphorous in all motor oil anti-wear packages is also a known catalyst toxin in the industry.

This Chevy 350 oil has sophisticated additives that engine aid wear reduction. It is considered the best motor oil for high mileage Chevy 350, advised by numerous car experts.

Specifications

• Model: 03111-3PK.
• Made: USA.
• Dimensions: ‎14.3 x 12.6 x 10.1 inches.

Viscosity & Capacity

The viscosity grade of Castrol GTX is 10W-40 with the capacity of 5 quartz.

2. AmazonBasics Full Synthetic Motor Oil

AmazonBasics full-synthetic 0W-40 motor oil is designed for many European autos, particularly turbocharged versions.

This recommended oil for Chevy 350 efficiently lubricates engine moving components and protects them against initial wear and tear.

This Chevy 350 oil plays an important role in vehicle maintenance, topping off levels, or doing a complete oil change.

AmazonBasics full-synthetic motor oil forms a protective layer on engine components, reducing wear. This high mileage Chevy 350 oil improves fuel efficiency.

It promotes improved power production and performance by reducing friction from an engine's in-contact moving components (which lose otherwise valuable power).

Full-synthetic motor oil keeps engines clean by reducing undesirable buildup that can cause severe rust and corrosion.

The motor oil resists viscosity and thermal and mechanical collapse. It also aids in the fight against unstable burn-off, which can minimize engine deposits and exhaust pollutants.

Specifications

• Model: AM06043Q.
• Made: USA.
• Dimensions: ‎7.75 x 4.25 x 12.5 inches.

Viscosity & Capacity

The viscosity grade is 0W-40 with the capacity of 5 quartz.

3. Valvoline High Mileage with MaxLife Technology

If your vehicle has more than 75,000 miles on it, it's time to tackle engine wear using the world's best high mileage oil.

Valvoline High Mileage with MaxLife Technology Synthetic Blend Motor Oil is designed to combat the causes of high mileage engine breakdown: wear, deposits, sludge, and leaks.

This premium, synthetic-blend Chevy 350 oil was developed with proprietary MaxLife Technology to maximize the life of engines over 75,000 miles. It is designed to provide a thick and durable anti-wear film.

It also protects against sludge and deposits, rejuvenates aging engine seals, and resists motor oil breakdown in extreme conditions.

Valvoline High Mileage with MaxLife Technology Synthetic Blend Motor Oil is designed to safeguard engines with more than 75,000 miles.

The patented recipe guards against the four principal causes of engine breakdown in high mileage engines: wear, friction, heat, and deposits.

This Chevy 350 oil also includes premium seal conditioners, which revitalize aged seals and aid in treating and preventing leaks. Valvoline High Mileage with MaxLife Technology has been shown to extend engine life.

Specifications

• Model: 881148.
• Made: USA.
• Dimensions: ‎8.22 x 4.6 x 12.66 inches.

Viscosity & Capacity

The viscosity grade is 10W-40 with the capacity of 5 quartz or 1 quart.

4. Mobil 1 High Mileage Full Synthetic Motor Oil 10W-40

Mobil 1 Heavy Mileage full synthetic motor oil 10W-40 is developed to help extend engine life for high mileage engines with over 75,000 miles and features a special mix that protects 10,000 miles between oil changes.

Mobil 1 High Mileage is the most recommended oil, and it's categorized as the best oil for chevy 350. This oil contains a seal conditioner to help decrease oil leaks in high-mileage cars.

Its uniform synthetic oil molecules reduce friction, preventing deposits and sludge development.

This scientifically improved formulation provides exceptional internal engine heat protection (up to 500°F) and low-temperature protection (to -20°F), allowing quick cold-weather starting and ultra-fast protection.

Mobil 1 High Mileage protects your engine from low-speed pre-ignition (LSPI) and timing chain wear while keeping it clean.

Experts recommend Mobil 1 High Mileage full synthetic motor oil 10W-40 for all types of modern vehicles, including high-performance turbocharged and supercharged gasoline.

It is also recommendable for diesel multi-valve fuel injected engines found in passenger cars, SUVs, light vans, and light trucks, and is available in 1-quart and 5-quart bottles.

Specifications

• Model: 98KG82.
• Made: USA.
• Dimensions: ‎13 x 8.5 x 4.5 inches.

Viscosity & Capacity

The viscosity grade is 10W-40 with the capacity of 5 quartz.

5. Shell Rotella T5 10W-30

Shell Rotella T5 10W-30 diesel engine oil with Triple Protection Plus technology protects against wear, deposits, and oil breakdown. This Chevy 350 oil works by combining synthetic base oils with modern additive technology.

Compared to CJ-4 oils, these oils provide better oxidation protection under harsh situations. In the presence of biodiesel, this synthetic oil in Chevy 350 has shown resistance to oxidation and corrosion.

It has more extensive drainage capabilities. It also saves up to 2% on petrol compared to a standard 15W-40, allowing you to stretch your budget and enhance your bottom line.

Shell Rotella T5 10W-30 Synthetic Blend is designed for use in various heavy-duty engines.

Triple protection Plus technology combines synthetic base oils and innovative additive technology to give protection against wear, deposits, and oil breakdown. It performs 44 percent better than the maximum wear requirements.

Shell Rotella T5 10W-30 has greater cold-cranking capabilities than typical 15W-40 oils, allowing it to reach vital engine parts faster in cooler temperatures and reducing wear in tough conditions.

Specifications

• Model: 550045130-3PK.
• Made: USA.
• Dimensions: ‎13 x 12.75 x 8.5 inches.

Viscosity & Capacity

The viscosity grade is 10W-30 with the capacity of 4 quartz.

6. Pennzoil High Mileage Motor Oil 10W-40

Pennzoil high mileage vehicle motor oil is a common multigrid weight (viscosity grade) oil designed in gasoline engines in SUVs, light vans and vehicles, and passenger cars with over 75,000 miles.

Compared to ordinary oils, the enhanced composition helps avoid sludge build-up, offers general lubrication and wear prevention, and improves gas mileage. It's also carefully developed to prevent seal leaks and minimize oil usage in worn engines.

Pennzoil high mileage motor oil is a superior proprietary traditional mix with Active Cleansing Agents from America's premier motor oil makers.

Not only does it keep dirt and pollutants from forming performance-degrading deposits, but it also removes sludge. Furthermore, it is particularly prepared to aid in preventing seal leaks and reducing oil consumption in worn engines.

Because a cleaner, well-sealed engine is better protected and responsive, as we know at Pennzoil.

It fulfills or surpasses API SN's engine protection requirements and is particularly prepared to give further protection against the damaging effects of stop-and-go driving, as well as hot and low-temperature engine operating.

Specifications

• Model: 550045217.
• Made: USA.
• Dimensions: ‎13 x 8.2 x 4.5 inches.

Viscosity & Capacity

The viscosity grade is 10W-40 with the capacity of 5 quartz.

7. HAVOLINE 10W-40 Motor Oil

Deposit Shield is a premium automobile motor oil that prevents deposits and sludge development and provides outstanding wear protection for vital engine components.

Deposit Shield Technology Havoline Motor Oils are designed for four-stroke gasoline engines in passenger vehicles, light trucks, powerboats, motorcycles, and other mobile and stationary equipment.

They're ideal for tiny automobiles and light trucks with high-revving engines. Havoline Motor Oils with Deposit Shield Technology may be used in new and high-mileage vehicles and turbocharged and naturally aspirated engines.

After consulting with the relevant original equipment manufacturer's lubrication guidelines, they may also be suitable for natural gas engines in compact vehicles and light trucks.

Specifications

• Model: 223397485.
• Made: USA.
• Dimensions: ‎7.97 x 4.48 x 12.75 inches.

Viscosity & Capacity

The viscosity grade is 20W-50 with the capacity of 5 quartz.

8. Mobil Super High Mileage 10W-40 Motor Oil

Mobil Super High Mileage 10W-40 engine oil is a special high-mileage formulation that helps extend engine life in older vehicles by reducing oil consumption in two ways: increased viscosity and a seal conditioner to help prevent leaks.

It's made to preserve your engine in both hot and cold weather. It helps to extend the life of your engine by preventing sludge accumulation and engine wear.

Mobil 1 High Mileage 10W-40 motor oil excels our conventional and synthetic blend high mileage oils in overall lubrication and wears prevention.

It meets or exceeds the industry's strictest criteria and outperforms our conventional and synthetic blend of high mileage oils. In addition, the sophisticated complete synthetic formula can aid with:

• Increase the engine's lifespan
• Active cleaning chemicals can be used to remove engine sludge.
• Seal conditioner helps to prevent leaks.

Specifications

• Model: 112945-6PK.
• Made: USA.
• Dimensions: ‎10 x 8 x 9 inches.

Viscosity & Capacity

The viscosity grade is 10W-40 with the capacity of 1 quartz.

Best oil for high mileage Chevy 350 Buying Guide:

Chevy 350 model overview

Suppose you're wondering what a Chevy 350 is. In that case, it's a sort of small-block V8 engine manufactured by Chevrolet (under General Motors) between 1954 and 2003. The Chevy 350 is referred to as a small-block engine.

Compared to its other Chevy engine relatives, it has a lower displacement range of 262 cubic inches to 400 cubic inches or 4. 3L to 6. 6L engines.

The series was dubbed "small-block" because of its tiny size compared to the physically much bigger Chevrolet big-block engines. It ranged in displacement from 262 cu in (4. 3 L) to 400 cu (6. 6 L).

Recommended Oil by Manufacturer

Castrol GTX is a highly recommended oil for Chevy 350.

Optimal Viscosity for oil in Chevy 350

The current Chevy 350 engine is compatible with 10w-40 viscosity oil.

Fuel efficiency

Reviews suggest that Castrol GTX 10w-40 is one of the best high mileage Chevy 350 oil, with an efficiency difference of 13 to 17 percent compared to its counterparts.

Weather Compatible

Castrol GTX 10w40 works more efficiently in standard and cold weather. You give the vehicle alight start-stop in cold weather compared to other oils.

Technical Specifications

It has a 5.7L (350 cubic inches) small-block V8 engine with a bore of 4.00 inches and a stroke of 3.48 inches. This engine may produce between 145 and 370 horsepower depending on the year, make, and model of the vehicle in which it is installed.

Included Additives

Phosphorus replacement treatment, seal conditioners, and advanced additives are present in this recommended oil for Chevy 350. These additives help fight any sludge, corrosions and enhance the emission system's life.

Chevy 350 Oil Change:

Step 1

You may not have a perfectly level space to work, but you should endeavor to park in the most level location.

When working on level ground, you'll find it much simpler to work on your vehicle and change its oil. You should also use wheel chocks and set the truck's emergency brake to restrict it from moving.

Step 2

You don't want an oil leak on your driveway after you're finished. Just in case, place a drop cloth or sheet beneath the oil collecting pan. In this manner, if some of the oil spills, it will be easier to clean up.

Step 3

Also, you don't want to start looking for your tools while you're beneath your car. Gather all of the materials you'll need ahead of time.

Consider keeping items like; Towels for the store, pan for draining oil, Wrench for the oil filter, Oil filter replacement, brand-new oil which you are going to use, Tarp or a drop cloth, and a funnel near your hand.

Step 4

The only method to ensure that you replace your oil regularly is to keep track of your current mileage.

Put the next oil change interval on the filter housing using a black permanent marker. Alternatively, you may replace your oil every time the odometer reaches 5,000 miles.

Step 5

Then, you have to loosen but not remove the filling cap slightly. When the drain stopper is removed, you may enable the oil to flow freely by slightly opening it. Furthermore, taking it entirely off the bottle implies that anything may get inside, which is bad news.

Step 6

You may remove the drain pan after it is exactly aligned beneath the stopper. Make sure it doesn't fall into the oil drain pan, or you'll be wrist-deep in oil hunting for it.

Do yourself a favor and do anything else for a minute. Otherwise, you could be tempted to leave before all of the oil has been extracted.

Step 7

When all of the oil has been drained, replace the drain stopper. For the finest seal, use a new crush washer.

Step 8

Please do not, under any circumstances, jam a screwdriver into the filter to drain it. Yes, removing the filter might be dirty, but it's preferable to causing harm to your vehicle.

With a wrench, remove the oil filter and clean the housing surface. Make certain that any stuck-on rubber is removed. Then the replacement oil filter gasket must be attached to a clean surface.

Step 9

Fill the new oil filter and the rubber gasket with a modest oil. When installing the filter, this simple step guarantees that it seals to the housing.

Step 10

Replace the old oil filter with a new one, but don't over-tighten it. Tighten the new filter until it makes contact, and then add 3/4th of a turn. Some people consider this to be hand tightened plus 1/4th of a turn.

Step 11

Remove the oil filter lid and fill the engine with your funnel. Check if the funnel can accommodate the size of your oil container. Replace the cap after you've poured the oil in.

Final Step

Run the engine for a few minutes and double-check the oil levels to ensure everything is in working order. Once everything is circulating, you are good to go.

Oil change interval (Best Practice)

The general rule of thumb for Chevrolet vehicle oil changes is every 7,000-10,000 miles. However, certain cars may require oil changes sooner than others, especially for high-mileage automobiles.

Even if you don't use your car much, get it serviced at least twice a year. Even if your automobile is not in use, oil degrades over time. The technicians should also replace the oil filter when you get your oil changed.

Are you debating whether to use synthetic or traditional oil? Consult your owner's handbook. Although synthetic oil is more expensive, it lasts longer and is often of superior quality.

Standard Maintenance Plan of Chevy 350:

There's no danger in maintaining your car sooner or more regularly. Still, delaying service may result in avoidable damage and pricey repairs.

On the other hand, newer Chevrolet vehicles should include a dashboard notice when it's due for periodic maintenance to make things easier.

Keeping track of your service history allows experts to assess the health of your vehicle better.

Keeping the Chevy 350 oil changed after intervals of 5000 miles is ideal in almost every situation. It gives your car more mileage, a better fuel economy, and an engine to last decades.

Chevy 350 oil type:

5W-30 oil is recommended in late-model Chevy 350s, such as the LT-9, L83, L98, L05, or L31.

10W30 or 10W40 are more suitable for earlier versions like the LT1, L82, or L81.

What do those letters and numbers imply now?

The numerals denote the oil's viscosity grade (based on the Society of Automotive Engineers j300 standard), while the W denotes the season.

A 5W30, for example, has a viscosity grade of 5 at colder temperatures and a viscosity grade of 30 at higher temperatures, according to SAE J300.

The same is true for 10W30/10W40.

The new Chevy 350 needs less viscosity than old engines because they have better cooling systems and sealing technologies.

FAQ’s

1. What brand of oil does Chevy recommend for Chevy 350?

Chevy recommends Castrol High Mileage 10W-40 Motor Oil for Chevy 350. Castrol is a trusted and well-known brand of high-quality oil. This synthetic mix 10W-40 is designed specifically for high mileage automobiles such as the Chevy 350.

2. Is 10w40 good for high mileage?

Experts recommend Mobil 1 High Mileage 10W-40 motor oil for use in high mileage vehicles, including cars, trucks, SUVs, and vans, even if they had previously used lower grade conventional lubricants.

3. How much oil does a Chevy 350 take?

If you have an unaltered factory Chevy 350, the oil capacity is 5 quarts.

4. What oil should I use in my Chevy 350?

Most people use 5W-30 oil in late-model Chevy 350s, such as the LT-9, L83, L98, L05, or L31. Most people use 10W30 or 10W40 on earlier versions like the LT1, L82, or L81. It depends on which vehicle engine type you are using.

5. Can I mix 5w30 with 10w40?

There is nothing that prevents you from combining engine oils of varying viscosities. Depending on the mix ratio, the viscosity will be anywhere between the two combined oils.

6. Which oil is better, 10W30 or 10W40?

10W40 oil has a greater viscosity and retains more thickness when the temperature increases than 10W30 oil. In that instance, 10W-40 motor oil would offer superior protection against engine wear contact at higher temperatures.

So, what is the Recommended oil for high mileage Chevy 350?

There has long been a heated debate among enthusiasts about which oil is the best for Chevy 350.

So, In this detailed article, we have tried to make comprehensive data on all the recommended high mileage Chevy 350 oil and conclude that Castrol GTX is considered as the best synthetic oil for high mileage Chevy 350.

Castrol GTX has high perseverance for catalytic convertors, emission systems, sludge, and other deposit erosions, making it the best contender for a high mileage Chevy 350 oil.

A pure synthetic oil in Chevy 350 is significant, and Castrol GTX fulfills these needs. So our results conclude that the best high mileage oil is Castrol GTX.