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Originally Posted by Isaac Zachary
Older systems used diesel fuel and didn't use any DEF for SCR.
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Older systems which didn't feature SCR, so there was no need for DEF.
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Do DEF systems not need any unburnt fuel to do the same?
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Are you sure we're talking about the same system. DPF which is the particulate filter does use fuel. DEF is that urea-based exhaust fluid, sprayed into the exhaust to decrease NOx emissions. The housing of the DPF core might be the same spot where the DEF is applied, but it doesn't imply the SCR would require fuel to work.