CK-4 oil
Anybody change to this new oil for their tow vehicle. chevman
Forum Discussion
Stick with a CK-4 API oil and avoid a CK-4/SN oil for now.
Popular 15W40 CK4 oils that do not have reduced Zinc/Phos:
Motorcraft
Connoco Phillips
Rotella
Valvoline Premium Blue
Popular 15W40 CK4/SN oils that have reduced Zinc/Phos because they're dual rated for both Diesel and gas (SN):
Delo
Delvac
Popular 15W40 CK4 oils that do not have reduced Zinc/Phos:
Motorcraft
Connoco Phillips
Rotella
Valvoline Premium Blue
Popular 15W40 CK4/SN oils that have reduced Zinc/Phos because they're dual rated for both Diesel and gas (SN):
Delo
Delvac
