Can petrol engine oils be used in diesel engines?
Petrol engine oils can only be used in diesel engines if the oil meets the minimum requirements specified by the Handbook. For example, if the Handbook requires API CE or CF than as long as the oil meets API CF or higher specifications than there is no issue. It will be better though for the engine if diesel oil is used. Note: If the Handbook requires an API CJ-4, an oil meeting API CI-4 will not be suitable.