You are mistaken; but I can see where all these 3 letter abbreviations can get confusing
ACD is full synthetic.
As far as "OEM" 10w30 oils by Amsoil - you are thinking of ADN, which replaced OEC.
Originally Posted By: Toptierpao
That oil is not 100% synthetic by Amsoil standards.This oil replaces their :"OEM" line and is reccomended for oem intervals of 8000 miles or so. It is an excellent choice for the 2007.5-2010 Cummins, Powerstrokes,and Duramax diesels. Because of the way these motors are forced to regenerate,oil analysis has shown they can have as much as 10% fuel dilution.Due to this,they should not go past the oem oci.
It is a very good high performance group III oil.
If you have a truck outside the years mentioned above,their "Max Duty" Signature Series(100% synthetic) is their Group IV/ Group V oil and has HTHS numbers in the mid 4's depending on your grade of choice.
ACD is full synthetic.
As far as "OEM" 10w30 oils by Amsoil - you are thinking of ADN, which replaced OEC.
Originally Posted By: Toptierpao
That oil is not 100% synthetic by Amsoil standards.This oil replaces their :"OEM" line and is reccomended for oem intervals of 8000 miles or so. It is an excellent choice for the 2007.5-2010 Cummins, Powerstrokes,and Duramax diesels. Because of the way these motors are forced to regenerate,oil analysis has shown they can have as much as 10% fuel dilution.Due to this,they should not go past the oem oci.
It is a very good high performance group III oil.
If you have a truck outside the years mentioned above,their "Max Duty" Signature Series(100% synthetic) is their Group IV/ Group V oil and has HTHS numbers in the mid 4's depending on your grade of choice.