Unsure how to know what oil your car takes? Knowing what motor oil your car requires is essential for engine health and longevity. There are a couple of ways to find the right oil, from the owner’s manual to vehicle stickers and online resources. Knowing the differences between mineral and synthetic oils, the importance of using the correct oil, and tips for checking your oil and filter can help you make informed decisions as a car owner.
Choosing the wrong motor oil can lead to engine damage, reduced performance, poor fuel economy, and costly repairs. Yet, many car owners are unsure of how to determine the correct type of oil for their vehicles.
Not knowing or understanding what engine oil does, what types are available, and how to tell the difference means that you risk damaging your car’s engine. This article walks you through the various ways to determine what kind of motor oil your car needs, the different types of oils, why using the right oil is important, and how often to check and maintain it.
Checking the Owner’s Manual
The easiest and most reliable way to know what oil your car takes is by referring to the owner’s manual. This manual contains specific recommendations from the manufacturer, including the type and viscosity grade of the oil that best suits your engine’s design. Ignoring these recommendations can lead to poor engine performance and costly wear over time.
Newer engine oils aren’t always better. All engine oil conforms to a specific standard, which determines the viscosity and quality of the oils under specific temperature ranges. Furthermore, engine oils are either mineral-based, synthetic, or mixed. Older cars will usually want a mineral or mixed engine oil, while most modern cars use synthetic engine oils.
Brands don’t matter as much as choosing the right type of oil. To check for your engine’s preferred oil type, first look for the section dedicated to engine specifications. Then, note both the oil type (mineral vs. synthetic) and viscosity grade (e.g., 5W-30). Finally, follow any manufacturer recommendations for climate or driving conditions, which may change the recommended viscosity grade.
Checking the Oil Cap or Sticker Under the Hood
In modern vehicles, there’s a clear indication of the recommended oil type either on the oil cap or a sticker under the hood. This is a quick and convenient reference, especially when you’re unable to access the manual for some reason. The oil cap often lists the correct viscosity grade, while the under-hood stickers sometimes provide more detailed instructions regarding oil type.
While quick and convenient, you shouldn’t rely on this method on second-hand, modified, or older vehicles.
Consulting the Vehicle Manufacturer’s Website or a Mechanic
If the manual is unavailable or if you’re uncertain about the information under the hood, another reliable source is the vehicle manufacturer’s website.
Many manufacturers provide easy access to the recommended oil for specific makes and models online. Most car owner manuals are also freely available as PDF downloads from each manufacturer’s website, often in multiple languages.
If you’re not confident in finding the right manual for your vehicle, then your best bet is to bring your car into an auto shop and ask for help. A mechanic will gladly help inform you of the right type of oil for your car, especially if it’s been a few thousand miles or more than a year since your last oil change.
Types of Motor Oil: Mineral vs. Synthetic
Motor oils come in different formulations, the two most common being mineral (conventional) and synthetic oils. Each has its advantages and is suited to specific types of vehicles and driving conditions. Using the wrong type can affect engine efficiency, wear, and longevity.
The long and short of it: use the oil recommended for your vehicle. Older cars tend to use mineral oils, while newer cars tend to run on synthetic oils, but it’s not a hard rule.
Mineral (Conventional) Oil:
Derived from crude oil, mineral oil is often less expensive and adequate for older vehicles or those with low-performance requirements. Cost point aside, conventional motor oil tends to perform worse under temperature extremes (high heat or freezing winters), and older engines running on mineral-based oils may perform worse outside of optimal temperature ranges.
Synthetic Oil:
Manufactured through chemical processes, synthetic oils offer better protection, especially under extreme temperatures and high-performance driving conditions. They are more expensive but provide superior lubrication and longer intervals between oil changes.
Why Using the Right Motor Oil Matters
The type and grade of oil you use directly impact your engine’s performance, efficiency, and longevity. Using the wrong oil can lead to inadequate lubrication, overheating, and accelerated wear. Conversely, the right oil provides optimal protection for moving parts, reducing friction and preventing harmful deposits from forming.
Motor oil is used primarily to prevent material damage through heat and friction. Combustion engines get hot because of the speed at which the internal components move, as well as the process of combustion itself. Motor oils work to cool the engine to prevent the block, the cylinders, and the pistons from being damaged throughout an engine’s lifetime. Furthermore, modern oils help keep debris that escapes in through the air and oil filters from damaging the engine before the next oil change.
Using the wrong oil or going too long before changing out your oil, your oil filter, or your air filter, will result in a shorter lifespan for your engine.
How Often to Check Your Oil and Oil Filter
Regularly checking your oil level and oil filter is critical to maintaining engine health. Even if you’re using the correct type of oil, driving with low oil levels or a clogged filter can cause major engine damage. Checking your oil regularly and changing the oil filter as per the manufacturer’s recommendation is essential. Check oil levels every 1,000 miles or at least once a month.
How to check your oil:
- Park your car on a level road or lot. Pull the brakes and make sure the engine is off and rested (wait a few hours).
- Undo the oil cap. Use the dipstick to assess the oil level and its condition (dark or gritty oil indicates it needs changing). The dipstick has an indicator with a minimum and maximum point to help you read the oil level.
- Finally, follow the recommended oil change intervals in your manual, which may range from 3,000 to 10,000 miles depending on the oil type and driving conditions.
Cleaning or replacing the oil filter during every oil change to prevent contaminants from circulating in the engine. A clogged filter can reduce oil flow and lead to engine wear. Air filters, which also prevent dust and debris from entering the engine through the grills, should be swapped out with the oil filter.
Conclusion
Knowing the right oil for your car is vital to maintaining your engine’s health and performance. By consulting your owner’s manual, checking the oil cap or sticker under the hood, and using resources like the manufacturer’s website or a mechanic’s expertise, you can ensure you use the correct oil type and viscosity.
