Motor Oil Info

Passive regeneration requires exhaust gas temperatures of approximately 600C (1100F). These relatively high exhaust gas temperatures occur naturally in trucks operating under heavy load and can trigger the combustion of soot in diesel particulate filter (DPF). Passive regeneration does not increase fuel consumption the way active regeneration does because, by design, it does not require the injection of additional fuel to increase exhaust temperatures.

All class 8 over-the-road tractors and medium-class applications use active regeneration via in-stream injection. In this method, diesel fuel used to burn soot in the DPF is injected directly ahead of the DPF and does not reach the crackcase, leaving the oil uncontaminated.

Light-duty diesel pickup manufacturers (Dodge, Ford, GM) have opted for a less-costly in-cylinder injection system. With in-cylinder injection systems, raw diesel fuel injected on the exhaust stroke can wash directly past the rings and into the crankcase, mixing with the oil. Regular washing of cylinders is a continuous source of fuel contamination in the crankcase and is not conducive to long-term engine protection. Used oil analysis results from 2007-2010 light-duty diesel vehicles showed some elevated fuel dilution, but at tolerable levels. Use a great synthetic diesel oil, AMSOIL.