ExxonMobil has responded to Shell's claim that Mobil Delvac 1300 Super 15W-40 does not meet API CK-4 performance standards, nor the more stringent requirements for Volvo, MACK and Cummins.
In a statement issued last Tuesday, and sent to OEM/Lube News, Exxon Mobil said "ExxonMobil stands by the quality of our products and re-affirms that Mobil Delvac 1300 Super 15W-40 carries valid OEM approvals and API CK-4 licensing."In addition, Volvo has confirmed that the Volvo VDS-4.5 and Mack EOS-4.5 approvals for Mobil Delvac 1300 Super 15W-40 remain intact based on the fully compliant data set originally submitted, which includes passing the Volvo T-13 engine test results for oxidation and viscosity increase at the more stringent Volvo limits. Beyond valid API licensure and OEM approvals, Mobil Delvac 1300 Super and Mobil Delvac Super FE have proven on-road performance in ExxonMobil controlled field trials utilizing 69 representative trucks accumulating 23 million miles. ExxonMobil cannot address the specifics of the test results Shell produced, because we do not have the data, but we are conducting a thorough investigation."