[1] Therefore, Rotella is not recommended for gasoline vehicles with catalytic converters due to the higher risk of damaging these emission controls.

[citation needed][2] Newer formulations of Rotella T6 however are API SM rated as safe for pre-2011 gasoline vehicles.

The Shell Rimula brand is multi-national and comparable in all aspects, including the classification names.

The lack of "friction modifiers" in Rotella means they do not interfere with wet clutch operations.

This is called a "shared sump" design, which is unlike automobiles which maintain separate oil reservoirs – one for the engine and one for the transmission.

When Rotella T6 was revised for the API specification (for use in spark ignition engines), its zinc levels were effectively reduced.

″The new API CK-4 and FA-4 categories are driven by changes in engine technology to meet emissions, renewable fuel and fuel economy standards for reduced CO2 and other greenhouse gas emissions″[5] Upon Release of CK-4 API Licensing (Dec/2016) FORD issued a statement stating ″Ford testing has shown some CK-4 type formulations have shown inadequate wear protection compared to CJ-4 formulations developed and licensed before 2016″ [6] Similarly, Stellantis also issued a TSB citing Oil requirements that eliminated CK-4 Rotella from being an approved option in the 6.7L Diesel engines.