GotQuestions? Lubricants

Q. If an oil meets the API category and any other standards set by my engine maker, what's the difference between that and a premium oil?

February 21, 2013

SHARING TOOLS        | Print Subscribe

A. Many lubricant consumers refer to the basic engine manufacturer approvals and API credentials to determine whether or not the oil selected is suitable for service and complies with component manufacturer recommendations.

For example, the API provides a list of licensed and registered engine oil products.

However, many oil brands provide several products within their product lines that may all carry the same API credentials as well as engine manufacturer approvals.

An engine oil manufacturer may offer several heavy-duty engine oil options, all listed as API CJ-4, with all the same engine manufacturer approvals or recommendations. The confusion comes when attempting to differentiate whether or not there is true performance advantage in the number of options within the brand. The scope of this message cannot provide all the details needed to offer an adequate response but here are few basic comments:
a. What a heavy-duty engine oil is listed and licensed at is not the only thing to consider. The testing and certification process can produce different performance results. For example, a test used to qualify CJ-4 oil can have as much as a 50% variance in allowable passing limit versus the "headroom" performance that can be achieved with premium additive technology. Why is this important? It may not be for some equipment owners unless you need optimum engine life, operate in severe conditions or need longer service life out of your engine oil.
b. Oils also can be further tested in real operating conditions or in real-world fleet conditions. This further shows an accurate level of performance by providing real-world field testing results. This, combined with engine teardown inspections at extended mileage levels, provides another level of evaluation. Premium performing oils will show outstanding results versus oils that are produced just to meet minimum passing levels.
c. Before buying an oil at face value that it meets all the credentials, an equipment owner should at the very least ask a supplier specifically what level of performance confirms and supports the advertised claims.

Related Posts

Comment On This Story

Comment: (Maximum 2000 characters)  
Leave this field empty:
* Please note that every comment is moderated.

Author Bio

Mark Betner

sponsored by

Heavy Duty Lubricants Manager

Mark Betner boasts 35 years of experience in the lubricants business. As the Heavy Duty Product Manager for CITGO Lubricants he is responsible for initiating and implementing the marketing of new products and human development programs and oversees communications with the media, trade shows and consumer education.

Prior to this, he was a field sales manager and technical training administrator at an independent lubricant company specializing in heavy equipment lubrication.

Mark earned a master’s and bachelor’s degree in both chemistry and biology from Indiana University. He holds a certification from the Society of Tribologists and Lubrication Engineers and is a member of the Truck Maintenance Council.


We offer e-newsletters that deliver targeted news and information for the entire fleet industry.


ELDs and Telematics

sponsored by
sponsor logo

Scott Sutarik from Geotab will answer your questions and challenges

View All

Sleeper Cab Power

Steve Carlson from Xantrex will answer your questions and challenges

View All