When comparing motor oils, the most important thing to do is compare the technical specifications. These can generally be found on the company's website, although sometimes it may be necessary to contact the company to ask that they provide them. Each specification is found using a standardized testing method (ASTM-American Society of Testing and Materials) and is assigned a certain test number.
Different companies provide different test results. Some will leave out certain tests. They may feel they are unimportant. They may not want you to know a particular test specification.
Image via WikipediaThere are around 16 specifications you might see on the data sheet for any given oil, although it's more likely you will find around 8 or 9. Which are most important? There are three that you should focus on: the NOACK volatility test, the Four Ball Wear Test and the HT/HS test. These three are designed to simulate conditions you might actually find in your engine. If any of them are missing or left out, it could mean you are looking at an inferior oil. Also, if you find entries that read "Meets or Exceeds All Requirements", you should be skeptical. Look for oils from companies that are willing to publish the results of standardized testing. Also beware of companies that list results of non-standard testing in an effort to look impressive.
Another option is to use the website, TheMotorOilEvaluator.com. There are technical specifications for over 650 motor oils from over 30 companies. It is a searchable database which has an application which makes comparing particular oils easy. This website allows you to make just about any motor oil comparison as you try to decide which brand to use in your vehicle.
The Motor Oil Guy
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