Attention: TDR Forum Junkies 
Disclaimer: Regarding Amsoil S3000 (HDD) or any other non CJ compliant oil, this does not apply to 2007 emissions vehicles.
Wanting to use something like Amsoil Series 3000 SAE 5W30 Heavy Duty Diesel oil, like me? From reading this literature, I believe you can.
"Some oil suppliers might claim better fuel economy for the lower viscosity oils. Lower viscosity results in lower oil film thickness. Therefore, Cummins Inc. has required that all xW30 oils registered under CES 20078 (API CI-4) must meet the minimum High Temperature / High Shear viscosity of 3. 5 cSt. These can be used over a wider temperature range than other 10W30 or 5W30 oils. As these oils will have directionally thinner oil films than 15W40 oils, top quality Fleetguard® filters must be used above 20°C [70°F]. See Figure 1 for viscosity recommendations. "
Amsoil 5w30 HDD meets both requirements marked in bold.
http://cummins. dk/fileadmin/dokumenter/Pdf_filer/Cummins_Litteratur/Olie_3810340-04.htm
Wanting to use something like Amsoil Series 3000 SAE 5W30 Heavy Duty Diesel oil, like me? From reading this literature, I believe you can.
"Some oil suppliers might claim better fuel economy for the lower viscosity oils. Lower viscosity results in lower oil film thickness. Therefore, Cummins Inc. has required that all xW30 oils registered under CES 20078 (API CI-4) must meet the minimum High Temperature / High Shear viscosity of 3. 5 cSt. These can be used over a wider temperature range than other 10W30 or 5W30 oils. As these oils will have directionally thinner oil films than 15W40 oils, top quality Fleetguard® filters must be used above 20°C [70°F]. See Figure 1 for viscosity recommendations. "
Amsoil 5w30 HDD meets both requirements marked in bold.
http://cummins. dk/fileadmin/dokumenter/Pdf_filer/Cummins_Litteratur/Olie_3810340-04.htm
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