Should You Switch to Different Oil in the Fall? Decoding the Seasonal Oil Change

As the leaves change color and the air turns crisp, many drivers start thinking about preparing their vehicles for the colder months ahead. One question that often pops up is: “Should I switch to a different oil in the fall?” At AES, we’re here to clear up the confusion and provide you with the information you need to make the right decision for your car’s engine.

Understanding Oil Viscosity and Temperature

Motor oil’s primary job is to lubricate the moving parts of your engine, reducing friction and preventing wear and tear. Viscosity, a measure of oil’s thickness and ability to flow, plays a crucial role in how well it performs this function. In colder temperatures, oil tends to thicken, making it harder for the engine to start and for the oil to circulate properly.

This is where the numbers on your oil bottle come into play. For example, 5W-30 oil means the oil has a viscosity rating of 5 when cold (“W” stands for winter) and a viscosity rating of 30 when hot. Lower numbers indicate thinner oil, which flows more easily at lower temperatures.

The Myth of the Fall Oil Change: What’s Changed?

Back in the day, before the widespread adoption of multi-viscosity oils, the advice to switch to a lighter weight oil in the fall held more weight (pun intended!). Single-grade oils, like SAE 30, thickened significantly in cold weather, making them unsuitable for winter driving. Therefore, switching to a thinner oil for winter was a necessity.

However, with the advent of multi-viscosity oils, this advice has largely become outdated. These advanced oils are formulated to maintain optimal viscosity across a wider range of temperatures, providing excellent engine protection in both summer and winter.

So, Do You Need to Change Your Oil Type in the Fall?

The short answer is: Probably not.

Modern vehicles are typically designed to run on multi-viscosity oils like 5W-20, 5W-30, or 10W-30 year-round. If your vehicle’s owner’s manual recommends one of these oils and you’ve been using it consistently, there’s usually no need to switch to a different type for the fall season.

When a Fall Oil Change Might Be Beneficial

While a seasonal oil type change isn’t usually necessary, there are some situations where it might be beneficial:

• Older Vehicles: If you have an older vehicle (pre-1990s) that originally recommended a single-grade oil, consulting with a mechanic is wise. They can help you determine if a multi-viscosity oil appropriate for your climate is a better option.
• Extreme Cold Climates: If you live in an area with consistently sub-zero temperatures, you might consider using an oil with a lower winter viscosity rating (e.g., 0W-20). However, always consult your owner’s manual first and, when in doubt, seek professional advice.
• Heavy Towing in Summer: If you consistently tow heavy loads during the summer months and use a slightly thicker oil for that purpose, switching back to the recommended oil for winter driving may be prudent.

The Importance of Regular Oil Changes, Regardless of Season

While changing your oil type might not be necessary, maintaining a regular oil change schedule is absolutely crucial for the health and longevity of your engine. Dirty or degraded oil loses its ability to lubricate effectively, leading to increased friction, wear, and potential engine damage.

Refer to your vehicle’s owner’s manual for the recommended oil change interval. Factors like driving habits, vehicle age, and the type of oil used can influence this interval. It’s usually expressed in terms of mileage or time (e.g., every 5,000 miles or every 6 months, whichever comes first).

What to Do This Fall: Focus on Overall Vehicle Maintenance

Instead of focusing solely on the oil type, prioritize a comprehensive fall maintenance check to ensure your vehicle is ready for winter. This includes:

• Checking tire pressure and tread depth
• Inspecting brakes
• Testing battery health
• Topping off fluids (antifreeze, windshield washer fluid, power steering fluid)
• Replacing worn windshield wipers

Conclusion: Stay Informed, Stay Protected

The need for a seasonal oil type change is largely a thing of the past, thanks to advancements in oil technology. However, understanding the role of oil viscosity and the importance of regular oil changes is crucial for maintaining your vehicle’s performance and reliability. When in doubt, consult your vehicle’s owner’s manual or speak with the experienced technicians at AES. We’re always here to help you make informed decisions and keep your car running smoothly, no matter the season!