The ConocoPhillips API CJ-4 and CI-4 Plus engine oils comply with the Caterpillar Engine crankcase fluid ECF-2 and ECF-1 specifications.

The ConocoPhillips CJ-4 oils include Guardol ECT synthetic blend 15W40, Fleet Supreme EC 15W40 and Kendall Motor Oil Super-DX synthetic blend 15W40.

The ConocoPhillips line of CI-4 Plus oils, originally developed for pre-2007 engines, also meet the Cat specs.

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