BP Vanellus CNG 15W-40

Worth knowing

Cummins no longer recommends the Cummins CES 20074 specification for some spark-ignited gas engines. In service bulletin TSB190071 the maker lists the on-road gas engines ISL G, L9N, ISB6.7 G, B6.7N, ISX12 G and ISX12N, for which it no longer approves CES 20074 oils and requires a switch to CES 20092; that number is not in the entry for BP Vanellus CNG 15W-40. Some Cummins gas engines that the bulletin does not name are, according to the maker, incompatible with CES 20092 oils, and for them CES 20074 remains the requirement.

The Vanellus diesel oils of the same viscosity do not carry this gas approval, and the only diesel class here is API CF. The figures differ too: sulphated ash 0.65 % against 1 % in Vanellus 15W-40 CK-4 and 1.4 % in Multi A, base number 5.6 against 9.7 and 11.4 mg KOH/g. How Cummins builds its diesel CES codes on top of the API classes, and how a new number replaces an old one, is explained in the article on oil for tractors and construction machinery; in gas engines, as the bulletin shows, such a replacement applies only to the engines it names.