In most climates, changing your oil weight seasonally is not necessary unless you experience extremely significant temperature changes throughout the year.
Modern engine oils are designed to perform across a wide range of temperatures. A slightly thinner cold-weather viscosity oil (the number before the "W") may provide improved flow during cold starts, while a slightly thicker cold-weather viscosity oil may offer benefits in consistently warmer climates. However, the difference between common options such as 0W and 5W oils is minimal, and either is typically suitable for year-round use in many environments.
Most vehicle manufacturers specify a range of acceptable oil viscosities based on climate and operating conditions. The best source for determining the correct oil weight for your vehicle is your owner's manual or the manufacturer's recommendations.
When selecting your next oil change kit, always prioritize using the correct oil specification and viscosity approved for your vehicle.
To shop for oil that's right for your vehicle, head over to fcpeuro.com and enter your vehicle into the fitment selector.