Do I Need to Change My Motor Oil for Hot or Cold Weather?

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Changing oil is critical for your car's longevity and performance, and provides maximum protection against engine part wear and excessive heat. Motor oil is measured in viscosity, which is the thickness of the oil. In the past, oils for cars used the term “weight,” such as a 10 Weight-30 oil, to define the same thing that the term viscosity means today.

Before the introduction of synthetic motor oil, vehicle owners had to rely on oil formulations with only one viscosity. This helped alleviate the problems associated with the difference in thickness between the colder winter months and warmer summer months. Mechanics used a lightweight oil, such as a 10-weight for colder weather. During the warmer months of the year, a 30- or 40-weight oil prevented the oil from breaking down in the increased heat.

Multiviscosity oils solved this problem by providing a better flowing oil that remained thin when the weather turned cold while also thickening as the temperature rose. This type of oil provides the same level of protection for vehicles year round. So, no, vehicle owners do not need to change their motor oil for hot or cold weather.

How multiviscosity oil works

Multiviscocity oils represent some of the best motor oil for cars, because it provides protection for engines in a variety of different temperatures. The multiviscosity oil uses special additives, called viscosity improvers, that expand as the oil heats up. This expansion helps provide the viscosity needed at higher temperatures.

Once the oil cools down, the viscosity improvers shrink. This ability to adapt the viscosity to the temperature of the oil makes multiviscosity oils more effective compared to older motor oils, which vehicle owners had to change out according to the season and temperature.

Signs that you need to change your motor oil

Castrol motor oils, especially Castrol EDGE synthetics, last longer and help protect engines from deposits and leaks no matter the temperature. Regardless of their longevity, the motor oil in a vehicle eventually needs to be changed. Look for the signs that a vehicle's motor oil needs changing to protect your engine, including:

  • An engine running louder than normal could indicate it needs an oil change. Engine parts rubbing together can cause excessive engine noise. Ask a mechanic check the oil level and change or add oil in this case, in addition to replacing the car oil filter if needed.

  • The Check Engine or Oil Light comes on and remains lit. This indicates a problem with the engine or oil level. Have a mechanic run a diagnostic and check the oil level when this happens.

  • When a mechanic reports that the oil looks black and gritty, it is definitely time to have the mechanic change the oil.

  • Smoke from the exhaust pipe when it is not cold outside can also indicate a low oil level. Ask a mechanic to check the level and either bring it up to the proper level or change it.

Most mechanics apply a sticker somewhere inside the driver-side door when changing oil to let vehicle owners know when to change it again. Following a regular maintenance schedule and changing your vehicle’s oil at regular intervals ensure that a vehicle engine continues to run in prime condition. By using a multiviscosity oil, vehicle owners ensure that they use the best car motor oil to protect their engine.


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Pierre

8 years of experience
42 reviews
Pierre
8 years of experience
Honda Fit - Oil Change - Arlington, Massachusetts
Very good experience. He changed a dead battery, replaced air filters and did an oil change. Very happy with the work.
Toyota 4Runner - Oil Change - Boston, Massachusetts
Pierre was incredibly thorough with his work and the assessment he gave us. He really helped us out in a pinch. So friendly too!

Christopher

9 years of experience
4 reviews
Christopher
9 years of experience
GMC Acadia - Oil Change - Katy, Texas
Mr. Christopher was on time, pleasant, and extremely professional. Any questions or concerns I had about my vehicle he answered them. I would definitely recommend using his services and use him in the future.
Lincoln MKX - Oil Change - Houston, Texas
Awesome guy very knowledgeable and friendly. Great service! I will book with Chris again! Thank you!

Chris

21 years of experience
1719 reviews
Chris
21 years of experience
Hyundai Sonata - Oil Change - Irvine, California
This is the second time Chris has come out to service a vehicle for me and he's absolutely incredible. Knowledgeable efficient and very helpful. Definitely would recommend him to anyone!
Mini Cooper - Oil Change - Corona, California
I was very skeptical about using a mechanic from an online website I've never heard before. Being new to California and not knowing anybody to recommend a reliable/honest mechanic, I decided to give it a try. I am very happy with my decision. Chris called my to let me know he was available to come early. He wasted no time and started working on the car right away. He is very knowledgeable, professional and great in explaining everything. I would definitely recommend Chris and this company.

Behrak

8 years of experience
10 reviews
Behrak
8 years of experience
BMW 550i - Oil Change - Duluth, Georgia
Very friendly and fast service! He even called to ask if he could arrive a few hours early for appointment which was great!
Kia Sorento - Oil Change - Duluth, Georgia
Great mechanic, and showed me exactly what and why he was talking about as far as recommendations for service

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