Best Motor Oil for Hot Weather  2023 – Buying Guide and Review

Motor oil is important for a myriad of reasons but the best way to simplify it is that it plays an essential role in keeping your engine running smoothly. Motor oils that work well in cold weather will not be the best for hot weather because they don’t have a high enough viscosity to withstand higher temperatures. The best motor oils are those that can stay liquid even when it is scorching outside and are also designed to protect your engine from damage caused by heat and friction.

Experts have tested these oils to ensure they meet specific standards and withstand high temperatures without breaking down as quickly as other brands.

So let’s get started with our review!

List of the Best Motor Oil for Hot Weather

Valvoline Advanced Full Synthetic SAE 10W-30 Motor Oil 5 Q

Valvoline Advanced Full Synthetic SAE 10W-30 Motor Oil 5 QT provides excellent wear protection and helps prevent oil leaks in older engines. This full synthetic motor oil delivers all the benefits of a premium synthetic blend, including outstanding performance, while also providing the ease of use and value associated with conventional oils.

Valvoline MaxLife combines premium conventional and synthetic base stocks extra cleaning agents, seal conditioning agents, and anti-wear additives. It delivers exceptional performance in all weather conditions while helping to extend engine life, even in extreme operating conditions.

This oil is great for hot weather and for drivers who want to prolong the life of their engines. It meets API SM and ILSAC GF-15 standards for quality assurance and performance as well as all manufacturer requirements.

Valvoline offers an advanced full synthetic SAE 10W-30 motor oil formulated to provide performance benefits for new engines and high mileage automobiles. If your vehicle has more than 75,000 miles on the odometer, it’s time to start fighting engine breakdown. Automobile aficionados suggest switching to MaxLife Motor Oil for superior protection and more engine utility!


  • Fully compatible with synthetic and conventional oils
  • Durability at high temperature to help protect your engine under the most extreme conditions
  • Engineered to provide optimum performance and protection


  • Thin plastic oil container
  • You must plan the oil replacement

#2 Castrol 06246 EDGE 10W-40 Advanced Full Synthetic Motor Oil

Next on our list is the Castrol 06246 EDGE 10W-40 Advanced Full Synthetic Motor Oil. It’s engineered with fluid titanium technology to provide the ultimate protection for your vehicle, so you can drive with confidence.

Castrol EDGE motor oil is a premium full synthetic engine oil that delivers unprecedented performance and safety for your gasoline or diesel engine. It offers strength under extreme pressure while also protecting your engine against harmful deposits.

This is suited for hot weather because it contains a synthetic blend that is less likely to break down in the heat. It also has an advanced lubricant system that provides outstanding wear protection and resists degradation from oxidation so you can drive with confidence.

It is formulated with an advanced additive system that maximizes engine performance and helps protect against sludge and deposits.


  • Effectively cleans oil deposits
  • Improves fuel film strength
  • High oil viscosity rating


  • No LL-01 certification
  • Oil tends to leak

#3 Valvoline High Mileage with MaxLife Technology SAE 10W-40 Synthetic Blend Motor Oil

Third on the list is the Valvoline High Mileage with MaxLife Technology SAE 10W-40 Synthetic Blend Motor Oil. It features a synthetic blend that is formulated to resist breakdown in heat. It also has a special additive system that maximizes engine performance and helps protect against sludge and deposits.

Additionally, it is engineered for vehicles that are above 75,000 miles. This product uses advanced technology so you can drive with confidence, knowing your vehicle’s engine is protected for up to 20,000 miles or one year under normal conditions.

Plus, the SAE 10W-40 also has an engine-tuning agent which provides the best possible lubrication to your automobile. This ensures that your oil never becomes watery or gummy.

It also helps prevent sludge and deposits from forming in your engine by using patented anti-oxidants. This oil also has a high viscosity index which provides lower temperature and higher resistance to thinning at high temperatures.


  • Higher viscosity in cold temperatures
  • Protection against deposits and sludge
  • Advanced vehicle lubrication


  • Limited container

#4 Shell Rotella T5 Synthetic Blend 10W-30 Diesel Engine Oil

Engine oil is one of the most important aspects of maintaining a car, as it plays an integral part in keeping your engine running smoothly. Shell Rotella T5 synthetic blend reduces piston deposits and protects against wear on critical components for longer than 10,000 miles of usage between changes!

When in use, the Shell Rotella T5 helps to prolong the life of your engine by providing excellent shear resistance. This means that it will help maintain a stable viscosity at high temperatures and also provide low friction levels for improved fuel economy in newer engines.

The Shell Rotella T5 is known for its low ash formulation, making it an excellent choice for those looking to keep their engines running clean.

When you start your car in the morning, it can be hard to get a good grip on the slippery steering wheel. It’s even worse when winter comes around, and snow begins clogging up all of those cracks that aren’t meant for driving over. 

But thanks to synthetic oil from Rotella T5s oils, fuel economy will improve with less cold starts because this type of lubricant stays liquid at lower temperatures than conventional engine oil. This motor oil is designed for use in diesel engines operating at -32 degrees °C to 104 degrees °C. This is all done without compromising engine protection or durability.


  • Good engine cleanliness
  • Improved fuel economy performance
  • Protection against harmful acids and deposits


  • Packaging Error

#5 Mobil 1 120762 Synthetic Motor Oil 10W-30, 5 Quart

The advanced Mobil 1120762 Synthetic Motor Oil 10W-30 is designed to meet Mobil 1 full synthetic motor oil is designed to meet the demands of today’s high-performance vehicles. It contains a unique blend of synthetic oils that reduce engine wear to protect your vehicle’s life span by up to 50%.

Another reason why it’s great for hot weather is its thermal stability. This means that it won’t break down as easily and provides better protection than other coolants typically do, which can make your car work at peak performance when you need to be most efficient on the road or out in public places like shopping malls where air conditioning isn’t always available.

It provides excellent overall lubrication and wear protection and enhanced frictional properties for a smoother ride. This feature helps prevent deposits and sludge build-up in your engine for long life.

The Mobil 1 120762 Synthetic Motor Oil 10W-30 has been specially formulated to make cold starts easier and more efficient. This synthetic formulation contains performance additives that reduce wear while increasing fuel economy by up to 20%. As a result, your automobile will run smoother, quieter, and last longer.


  • Resist viscosity loss
  • Optimal protection in multiple driving conditions
  • Prevents sludge and deposits


  • Not for aviation or motorcycle engines
  • Not compatible with diesel engines

Motor Oil for Hot Weather – Buying Guide

In the summer, you may have a hard time deciding what motor oil to use. This buying guide can help!

What Oil Type Should I Choose?

There are three main types of motor oil: mineral, semi-synthetic, and full synthetic. Depending on the type of car you drive, one can be more beneficial than another.

  • Mineral Oil

While mineral oil is the most affordable, it provides the least amount of protection. Since it’s less economical, it’s not recommended to use in newer vehicles.

  • Semi-Synthetic Oil

As its name suggests, semi-synthetic oil uses a blend of synthetic and mineral oil. This leads to better performance than mineral oils, but has a lower cost than full synthetic oil.

Semi-synthetic oils are good for drivers with older cars or those who want an inexpensive option.

  • Synthetic Oil

Synthetic oil offers optimal performance and protection for your vehicle. However, it isn’t as affordable as the other oils and should be used with a car that needs to run in extreme conditions.

The oil type you choose will depend on your car’s model and mileage. For older cars, mineral oil will do just fine. But for modern cars, you’re going to need semi-synthetic or synthetic oil to ensure your engine runs at its best.

Engine Oil Viscosity

The engine oil viscosity is the most important component when selecting motor oil for hot weather. Here are two important things you’ll need to remember:

  1. The first number before our “W” refers to its viscosity rating on lower temperatures. The lower this number, the more liquid like a substance will be in cold weather conditions – meaning that thinner oils are better for engines when they get really chilly outside!
  2. The second number after the W” measures its viscosity rating on higher temperatures. The higher the number means the more efficient the oil is at higher temperatures.

The viscosity is the measurement of a fluid’s resistance to flow. The oil viscosity rating, measured in cst (centistokes), tells you how well an engine lubricant will resist thinning away when heated up for extended periods.

The lower the number on the oil bottle means that it has a greater ability to withstand colder climates. Meanwhile, the higher the number means, the more resistant it is to thinning when hot and exposed to the elements.


In summary, good motor oil for hot weather must be able to withstand high temperatures. This is why it’s important for you to use the right kind of oil in your car, and not just any old thing off the shelf. If you live in a place where summers are scorching, make sure that your next purchase is one that can handle higher temps without sacrificing quality or performance. 

F.A.Q – Motor oil for Hot Weather

What is the best engine oil for hot weather?

For temperatures ranging from 80 (degrees) to 100+, the oil will become more watery or viscous. This means that the increased temperatures will cause it to thin faster.

Because of that, The best engine oil for hot weather is one that balances between the two extremes. Too much thinning, and your oil will lose its cooling efficiency. If the engine oil is too thick, it will not be able to flow properly.

Is 5w30 or 10W30 better for summer?

The 10W30 is better if you need reliable car oil for the summer. 10w30 has a higher viscosity grade than 5w30. This means that the oil is thicker and can withstand higher temperatures.

However, it would have a difficult time in the winter because its thickness blocks any kind of air circulation. The 5w30 can be used for colder environments. Since the oil viscosity is lighter, it will flow more freely during the winter.

What is the best oil to use in the summer?

During the summer, you want to use an oil that thick and durable. Low viscosity oils will thin out quickly, leading to a higher rate of engine corrosion.

It means that you should use a thicker oil like Valvoline Advanced Full Synthetic SAE 10W-30 Motor Oil 5 Q or Mobil 1 120762 Synthetic Motor Oil 10W-30 for the summer months because they can withstand high temperatures and are less likely to break down.

In addition, it is important to change your oil every four thousand miles during the summer in order to keep things running smoothly

Is 5w30 good for hot weather?

In hotter climates, you’ll want to select the engine oil with a higher viscosity. This is because these oils are less likely to turn viscous under the heat of the sun, which can lead to engine damage.

If you were to use 5w30 in hot weather, the oil would thin out to the point where it would not be doing its job of lubricating and protecting your engine from heat.

Petroleum oils, or “straight” oil-like 5w30, are made up of hydrocarbons that are not very viscous. This makes them well suited for colder climates where the engine operates at lower temperatures and so does less harm to your vehicle’s engine over time.

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