Finding your car's oil and filter specifications
The fastest way to find what oil and filter your car needs is to check your owner's manual — it lists the exact viscosity grade and filter part number for your vehicle. If you don't have the manual, you can look up the information using your vehicle identification number (VIN), which is a 17-character code stamped on your dashboard near the windshield or on your driver's side door jamb.
Most auto parts stores have free lookup tools on their websites and in their stores. You enter your vehicle's year, make, model, and engine size, and the system returns the correct oil viscosity (like 5W-30 or 10W-40) and the filter part number. Some stores also let you search by VIN directly, which is even faster because it eliminates guessing about which engine your car has.
You can also call your vehicle's dealership parts department with your VIN. They will tell you the exact specifications and can often quote you a price. Dealership oil and filters are usually more expensive than aftermarket options from auto parts stores, but they are may provide to be correct for your vehicle.
Key Takeaways
- Your owner's manual contains the exact oil viscosity grade and filter part number your vehicle needs.
- Auto parts store websites and in-store lookup tools let you search by year, make, model, and engine size to find the right specifications.
- Your vehicle identification number (VIN) is the most reliable way to look up specifications because it eliminates confusion about which engine your car has.
- Dealership parts departments can provide specifications and pricing, though their prices are typically higher than aftermarket retailers.
- Oil viscosity grade (like 5W-30) and filter part number are the two pieces of information you need to purchase the correct products.
Understanding oil viscosity grades
Oil viscosity is a number that describes how thick or thin the oil is. The most common grades are 5W-30, 10W-40, and 0W-20. The number before the "W" (which stands for winter) tells you how the oil flows in cold temperatures. The number after the W tells you how it flows at normal engine operating temperature. A lower number means the oil flows more easily when cold, which matters if you live somewhere with harsh winters.
Your owner's manual specifies one or sometimes two acceptable viscosity grades for your engine. Using a different grade can affect fuel economy, engine wear, and cold-start performance. Some newer vehicles require low-viscosity oils like 0W-20 or 0W-16 because the engine is designed around that thinner oil. Older vehicles often need heavier oils like 10W-40. Using the wrong viscosity can damage your engine or void your warranty.
If your manual lists multiple acceptable grades (for example, 5W-30 or 10W-30), you can choose between them based on your climate. In cold climates, the 5W option flows better in winter. In warm climates, either option works fine.
Locating the correct filter part number
The filter part number is specific to your vehicle's engine and cooling system design. It is not interchangeable across different makes and models, even if the filters look similar. Using the wrong filter can result in improper oil flow, leaks, or engine damage.
Your owner's manual lists the filter part number in the maintenance section. If you are looking it up online, the auto parts store system will return the correct part number when you enter your vehicle information. Write down the full part number before you go to the store or place an order, because part numbers are long and straightforward to misread.
Some vehicles have multiple filter options — for example, a standard filter and a premium or extended-life filter. The part numbers are different for each type. The standard filter is the minimum requirement; premium filters often last longer between changes, but they cost more. Your owner's manual specifies the minimum filter type your vehicle needs.
Where to look up oil and filter information online
Most major auto parts retailers have free lookup tools on their websites. AutoZone, O'Reilly Auto Parts, NAPA, and Advance Auto Parts all allow you to search by year, make, model, and engine size. Enter your information, and the system shows you the oil viscosity options and available filter part numbers with prices.
Some retailers also let you search by VIN, which is faster and more accurate. You paste your VIN into the search box, and the system automatically identifies your exact engine and returns only the products that fit your vehicle. This eliminates the risk of selecting the wrong engine option if your vehicle model came with multiple engine choices.
If you prefer not to shop online, you can visit an auto parts store in person and ask an employee to look up your vehicle information. Bring your VIN or your owner's manual with you. Store employees can also show you the difference between standard and premium filters and explain the cost difference.
Synthetic versus conventional oil
Your owner's manual specifies whether your vehicle requires synthetic oil, conventional oil, or allows either type. Synthetic oil is chemically engineered and lasts longer between changes — often 7,500 to 10,000 miles or more, depending on the product. Conventional oil typically needs to be changed every 3,000 to 5,000 miles. Synthetic oil costs more per quart, but you buy it less often, so the total cost per mile is often similar or lower.
Many newer vehicles are designed to run on synthetic oil and may require it to maintain the warranty. Older vehicles often run on conventional oil. Some vehicles allow either type, which gives you the choice. Check your owner's manual to see what your vehicle needs or allows.
If your manual allows either type, you can switch from conventional to synthetic at any time. You do not have to use synthetic from the first oil change. However, once you switch to synthetic, you should continue using it because synthetic and conventional oils have different properties and should not be mixed in the same engine.
What to do if you cannot find your owner's manual
If you have lost your owner's manual, you can read a free PDF version from the manufacturer's website. Go to the main website for your vehicle's brand, look for a "owners" or "support" section, and search for your vehicle year and model. Most manufacturers provide free manual downloads.
You can also order a printed copy from the dealership, though this usually costs $20 to $50. If you need the information right away, the online lookup tools at auto parts stores are faster. You can have the correct oil and filter in your hands within an hour.
Another option is to search for your vehicle's specifications on forums or enthusiast websites dedicated to your vehicle's make and model. These communities often have the information pinned or easily searchable. However, always verify the information against your owner's manual or an official source before purchasing, because forum information can sometimes be incorrect.
Frequently Asked Questions
Can I use a different oil viscosity than what my manual says?
No. Using a different viscosity can damage your engine and may void your warranty. Your manual specifies the viscosity your engine is designed for. If your manual lists multiple acceptable grades, you can choose between them based on your climate, but do not use a grade outside that list.
What if my vehicle model came with multiple engine options?
This is why using your VIN is important. Different engines in the same model year and make require different oil and filters. When you search by VIN, the system automatically identifies which engine your specific vehicle has and returns only the correct products. If you search by year, make, and model alone, you may see multiple options and have to guess which one is correct.
Is it okay to mix synthetic and conventional oil?
You should not mix them in the same engine. Synthetic and conventional oils have different properties and are not designed to work together. If you want to switch from conventional to synthetic, drain the old oil completely and refill with synthetic. Once you switch to synthetic, continue using it for future changes.
Do I need to use the dealership's oil and filter?
No. Aftermarket oil and filters from auto parts stores work fine as long as they meet your vehicle's specifications. Dealership products are often more expensive. The important thing is that the viscosity grade and filter part number match what your manual requires, not where you buy them.
What if the auto parts store system shows multiple filter options?
The system usually shows a standard filter and one or more premium options. The standard filter is the minimum your vehicle needs. Premium filters cost more but often last longer. Your owner's manual specifies the minimum filter type required. Any filter that meets or exceeds that specification will work.