The DPF filters the exhaust gas in the operation of the vehicle and absorbs much of the particulate filters which are caused by the combustion of diesel fuel. The degree of soot loading in the DPF is measured by the dynamic pressure sensor. If this back pressure reaches a certain limit, the soot particles, depending on engine type and engine management in various ways to finish.
There:
- injection into the combustion chamber (higher exhaust gas temperature)
- Fuel injection into the exhaust system (Increasing the exhaust gas temperature)
- admixture additive to the fuel (reducing the ignition temperature of soot particles)
The soot particles are "burned" by this process to carbon dioxide and can pass through the filter wall and the back pressure decreases.
In operation, also burned in small quantities of motor oil in the combustion chamber (natural oil consumption according to vehicle manufacturer). In conventional motor oil contains active ingredients that form metal ash from the combustion residues, which are also collected by the diesel particulate filter. These residues, in contrast to the soot particles is not "burned out" be and remain in the DPF.
The indicator for the content of these ash-forming residues in the engine oil is known as the sulfate ash content.
Conclusion: The lower the sulfate ash content of engine oils, the less residue of motor oil in the DPF - the longer the life of the DPF - and the back pressure during operation is also lower (no loss of performance and fuel savings).
comparison of standard motor oils (ACEA A3/B3, A3/B4) with DPF engine oils (ACEA 1/C2/C3/C4 C) on the basis of the sulfate ash content
ACEA A1/B1 ACEA A3/B3
≤ 1.3 ≤ 1.5
ACEA A3/B4, A5/B5 ≤ 1.6
ACEA C1, C4 ≤ 0.5
ACEA C2, C3 ≤ 0.8
image: Power (kW) of a car with a DPF using different motor oils
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