Can someone explain this please, I have just looked up the Mobil 1 Turbo Diesel 0W 40 and it's API spec is CF and the Mobil 1 ESP 5W 30 is also API CF.
According to the API Org http://www.api.org/certifications/engineoil/pubs/upload/engineoilguide_march2010.pdf
API CF is obsolete, so I am confused as to why Mobil are still quoting those specs on an oil that was developed after API CF was obsolete?
According to the API Org http://www.api.org/certifications/engineoil/pubs/upload/engineoilguide_march2010.pdf
API CF is obsolete, so I am confused as to why Mobil are still quoting those specs on an oil that was developed after API CF was obsolete?