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DPF cleaner works by lowering the combustion temperature of the soot caught in the DPF, making it burn off even in all city driving. It 100% works. In my old van I'd have the DPF light come on every 200km. After DPF cleaner, never saw the light again, and economy improved.
DFCO= Deceleration Fuel Cut Off. Throttle less engines (petrol or diesel) do DFCO very well.
Both my petrols and diesel behave the same way. In normal driving the thermostat barely opens (normal temp on the SG is 78*C), while the thermostat fully opens at 88*C. The radiator is barely warm after a drive.
That basically only happens when towing a trailer where I might see as high as 92*C.
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