Engine Oils
Background & Properties
castrol.com/GPS
800 255 4417
May 2025
GPS
Industry Specifications
Mack EO-O Premium Plus '07
is specification exceeded API CJ-4 with tighter pass limits in the Mack T-12, Cummins ISM and Cummins ISB
engine tests plus the addition of the Volvo D12D test. It can be used with diesel fuel containing up to 500 ppm
of sulphur.
Mack EO-N Premium Plus
In 2002, EO-N Premium Plus oil performance specification was made mandatory for usage in ASET™ AI and
AC engine models and was recommended for all MACK engine models (E-Tech™, E7, E6, etc.) regardless of
vintage. EO-N Premium Plus engine oil promotes longer engine life and reduced component wear, providing
a higher oil film thickness, better wear performance and improved oxidation control at higher oil
temperatures.
Cat ECF-3
Recommended for Caterpillar 2007 engines, this specification is the same as API CJ-4.
Cat ECF-1
Engine Crankcase Fluid Specification 1 (ECF-1) was issued in response to Caterpillar's concern regarding the
potentially negative side effects of industry standard API CI-4 oil formulations. CI-4 oils with high sulfated ash
had demonstrated unacceptably high piston and ring groove deposits in Caterpillar engines.
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