Frequently Asked Questions


Our customers often have questions about the uses and qualities of our products. If you do not find the answer here, go to the page that details that products specifications. If you still do not have an answer, please contact us.


Who makes O'Reilly's brand of oil?
What specs does O'Reilly motor oil meet and how does it compare to name brand oils?
What is the difference between SL and SM specifications?
What does the API donut on the back of the label stand for?
Is the O'Reilly AW 32 mineral oil based?
What is the boil point of O'Reilly DOT 3 brake fluid?
What benefits does O'Reilly Fuel Injector cleaner provide?
Where can I find a manufacturers/OEM cross reference for hydraulic fluids?
Does O'Reilly offer additional SKUs at special request?
What does MSDS stand for?
When should a consumer switch their vehicle over to high mileage oil and what are the benefits?
What are the benefits of synthetic vs conventional motor oil?
How does the viscosity affect the performance of motor oil?
Is O'Reilly 2-cycle oil premixed?






Question: Who makes O'Reilly's brand of oil?
Answer: O'Reilly's brand of oil is manufactured and packaged by Omni Specialty Packaging. Omni is an independent lubricant manufacturer in Shreveport, LA. While Omni is not affiliated with any "major" manufacturer, we do buy our base oils from companies like Exxon/Mobil and Shell. Lubrizol Corporation manufactures Omni's additives. Lubrizol is the largest lubricant additive manufacturer in the world.


Question: What specs does O'Reilly motor oil meet and how does it compare to name brand oils?
Answer: O'Reilly brand motor oils meet API 'SM' service classification and where applicable ILSAC 'GF-4'. Both API 'SM' and ILSAC 'GF-4' are the latest industry standards for passenger car motor oils. These are the same specifications that all "major" brand oils should meet.


Question: What is the difference between SL and SM specifications?
Answer: API 'SM' oils are designed to provide improved oxidation resistance, improved deposit protection, better wear protection, and better low-temperature performance over the life of the oil than API 'SL' oils.


Question: What does the API donut on the back of the label stand for?
Answer: The API Donut is the official motor oil license symbol of the American Petroleum Institute. It can only be used on motor oil containers when the fluid inside the container is registered with API. The 'donut' will have the API Service Classification for the oil clearly stated inside it.


Question: Is the O'Reilly AW 32 mineral oil based?
Answer: Yes, O'Reilly Brand Hydraulic Oils are made from mineral oils.


Question: What is the boil point of O'Reilly DOT 3 brake fluid?
Answer: The Reflux Boiling Point is greater than 450F and the Wet Boiling Point is greater than 284F.


Question: What benefits does O'Reilly Fuel Injector cleaner provide?
Answer: O'Reilly brand Fuel Injector and Carburetor Cleaner is specifically designed to remove performance robbing deposits in the fuel system. Regular use of Fuel Injector and Carburetor Cleaner will restore power and acceleration, smooth rough idling and prevent stalling caused by fuel system deposits.


Question: Where can I find a manufacturers/OEM cross reference for hydraulic fluids?
Answer: Unfortunately, there is no central place to go for OEM cross reference of most industrial oils, like hydraulic fluids. You should always call the Lube Tech Hotline for assistance with industrial fluids cross references.


Question: Does O'Reilly offer additional SKUs at special request?
Answer: There are several additional lubricant SKUs available from Omni Specialty Packaging. Call the Lube Tech Hotline to determine if the fluid you need is available and then call your "Special Order Department" to get a purchase order.


Question: What does MSDS stand for?
Answer: MSDS stands for Material Safety Data Sheet. MSDS is designed to provide both workers and emergency personnel with the proper procedures for handling or working with a particular substance.


Question: When should a consumer switch their vehicle over to high mileage oil and what are the benefits?
Answer: There is no set mileage at which you should say a vehicle is a "high mileage" vehicle. If you are having to add motor oil to the crankcase between oil changes due to leakage, the vehicle is a good candidate for O'Reilly brand High Mileage Motor Oil. The High Mileage Motor Oil will help condition the seals in the motor to prevent leaks.


Question: What are the benefits of synthetic vs conventional motor oil?
Answer: Synthetic motor oils offer the following benefits versus conventional motor oils; synthetics will increase the life of an engine, can offer longer oil change intervals under ideal driving conditions and protect your engine better under extreme driving conditions, especially extremely cold or hot weather.


Question: How does the viscosity affect the performance of motor oil?
Answer: Viscosity is the measure of an oil's resistance to flow and is the most important property of any lubricating oil. The Society of Automotive Engineers (SAE) has established the engine oil viscosity scale used exclusively today by auto manufacturers. You should always follow the manufacturer's recommendation on motor oil viscosity. If you use a lower viscosity than recommended, it can cause increased wear because of a thinner oil film. If you use a higher viscosity than recommended, it can cause wear and excessive heat because of restricted oil flow.


Question: Is O'Reilly 2-cycle oil premixed?
Answer: No, Master Pro 2-Cycle Oil is designed to be mixed with fuel supplied by the consumer.