| Subject: | Information on Duramax and Isuzu Diesel Engine Low Ash Oil - New Oil Reminder |
| Models: | 2007 Chevrolet W-Series Medium Duty Tilt Cab Models |
| 2007 GMC W-Series Medium Duty Tilt Cab Models |
| 2007 Isuzu NPR Commercial Models |
| Equipped with 5.2L 4HK1-TC Diesel Engine (DPF System) (VIN 6 -- RPO 1L5) and 12,000 lb GVW |
| 2007 and Newer Chevrolet T6500/T7500/T8500/C6500/C7500/C8500 Series |
| 2007 and Newer GMC T6500/T7500/T8500/C6500/C7500/C8500 Series |
| 2007 and Newer Isuzu FTR/FVR/FXR/HTR/HVR/HXR |
| Equipped with 7.8L Diesel Engine (DPF System) (VIN B -- RPO LF8) |
| 2007 Chevrolet Express, Kodiak C4500-C5500 Series, Silverado HD |
| 2007 GMC Savana, Sierra HD, TopKick C4500-C5500 Series |
| Equipped with 6.6L Duramax Diesel Engine (DPF System) (VIN 6 -- RPO LMM) |
| 2008 Chevrolet W-Series Medium Duty Tilt Cab Models |
| 2008 GMC W-Series Medium Duty Tilt Cab Models |
| 2008 Isuzu NPR/NPR-HD/NQR/NRR Commercial Models |
| Equipped with 5.2L 4HK1-TC Diesel Engine (VIN 6 -- RPO 1L5) |
Duramax and Isuzu engines are factory filled with high quality engine oil when they are built. This oil has an API service rating of CJ-4 and Low Ash intended for Diesel Particulate Filtration (DPF) systems. For these vehicles equipped with DPF systems,
Isuzu recommends engine oil that supports DPF (Low Ash Oil) and API service rating of CJ-4 be used when performing scheduled maintenance or repairs.
Refer to the Owner Manual for oil viscosity recommendations.
Notice: If you do not use this recommended oil in Duramax and Isuzu vehicles fitted with DPF, both the engine and the DPF may break down and fuel economy may decrease. Therefore, be sure to use the recommended oil type.
