Shell Rimula CK-4 FAQs

The new API CK-4 category is designed to meet the needs of current and next-generation engines. CK-4 oils replace CJ-4 oils, and are “backwards compatible” to all current vehicles.

Both products are designed to meet the new API CK-4 standard, but Shell Rimula R5 LE is a more advanced formulation. Both products are suitable for use in on- and off-highway equipment with Euro6 engines and older and meet the latest US and European OEM requirements for more modern engines that require oils meeting ACEA E9.

There are no miscibility concerns with the old and new products. Ideally customers would draw down their tanks so that no more than 10% of previous product remains as the full benefits of the new products will be diminished if mixed with previous product. This is also a good opportunity to clean a tank and do any necessary maintenance.

Our technical specialists are currently working on upgrading the formulation of Shell Rimula Ultra to meet the new CK-4 standards. More information will be shared in the near future.