Whereas the Lucas Magnum heavy duty diesel engine oil is labeled as an SAE 15W-40 viscosity grade, PQIA's test results show the oil to be a 10W-40.

As stated in SAE standard J300, "Since each W grade is defined on the basis of maximum cranking and pumping viscosities as well as minimum Kinematic viscosities at 100'C, it is possible for an oil to satisfy the requirements of more than one W grade. In labeling either a W grade or a multiviscosity grade oil, only the lowest W grade satisfied may be referred to on the label." 

SAE J300 goes on to say "a manufacturer may not release a product if its CCS viscosity as measured by the manufacturer is less than or equal to the stated limit of the next lower W grade." 

Since the Lucas 15W-40 tested meets both the cranking and pumping viscosity specifications for 10W, this product should be labeled as a 10W-40. 

Advisory.... Mislabeling of the viscosity grade may cause a consumer to use a grade of oil that is not recommended by the engine manufacturer and does not comply with the engine manufacturer's warranty. Click for details.                          

Although the Petroleum Quality Institute of America recently posted results on a sample of CITGARD 500 15W-40 heavy duty diesel engine oil we picked in the field, the product tested was older vintage... API CI-4.

We have since tested CITGARD 600, a product formulated to meet current diesel engine oil specifications.

The results of the tests conducted on the sample of CITGARD 600 meet the requirements of an SAE 15W-40, API CJ-4, CI-4 Plus, CI-4, CH-4/SM. 

Click for details on how CITGARD 600 looks side -by-side with other heavy duty diesel engine oils.                          

Report Concerns About Lubricant Quality to PQIA.  Information provided is Treated as Confidential and Callers can remain anonymous. Or email PQIA at:  tips@pqia.org 

The Petroleum Quality Institute of America's mission is to serve the consumer of lubricants by testing and reporting on the quality and integrity of lubricants in the marketplace. It is expected that this improved visibility of quality will lead to wider conformance by lubricant manufacturers to specification and performance claims. 

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