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Why does diesel drain into the sump on cars with a clogged DPF?
I read that you stated that modern diesels are unsuitable for successive runs from cold, which I fully comprehend, but how does diesel drain into the sump as a consequence?
Asked on 9 February 2013 by DM, via email
Answered by
Honest John
It's a complicated explanation, but extra diesel is pumped into the engine to regenerate the diesel particulate filter. If the filter is too blocked, the fuel does not get to the filter and instead dribbles down the engine bores into the sump, contaminating the sump oil and raising its level, sometimes to a point where the engine starts running on its sump oil which is when they blow up.
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