DIAPHRAGM 9C5790 - Caterpillar

The new API lubricating oil category CF-4 has been released. This new oil category provides oil properties for engines with performance requirements which meet emissions through 1993. This category will replace API CE which will probably become obsolete later in 1991. The performance tests for the CF-4 category include the new Cat 1K single cylinder oil test engine, L-38 engine bearing corrosion test and the Cummins and Mack multi-cylinder engine tests. The new Cat 1K engine test upgrades the engine hardware to represent today's technology and thus provide a much better oil performance test for today's engines with their emission requirements.
Oils will soon appear in the market with this API CF-4 performance rating. The Cat Engine Oil (EO) in the SAE viscosity grades of 10W30 and 15W30 meet the CF-4 performance requirements. Cat lubricant recommendations will also begin to specify this new API CF-4 category for Cat engines (particulary on-highway truck engines).
The API CF performance category is now under development as a replacement for API CD. The performance tests for this CF category will include the new Cat 1K single cylinder oil test engine and the L-38 engine bearing corrosion test. Again, the purpose of this new category is to upgrade the test hardware and improve the oil performance. The release of this oil performance category is expected to occur in the last half of 1991.
The API CF-2 category will probably be developed at some later time for two-cycle engines. It will be a replacement for the present API CD-II category. The performance tests for this CF-2 category will include the new Cat 1K single cylinder oil test engine, the L-38 engine bearing corrosion test and a two cycle engine test as defined by Detroit Diesel Allison. This new category like the other two has been developed with new hardware.