explanation of why I see so many failed forced regen attempts.
General rule is all engine related faults must be fixed and clear before dpf will regenerate.
faults here were...
P2463 Particle filter soot accumulation
P253F:68-AF Engine oil deteriorated
P0671:00-2F Glow Plug Cylinder 1
open circuit
P0672:00-2F Gow plug cylinder 2 circuit
P0673:00-2F Glow Plug Cylinder 3
P0674:00-2F Glow Plug Cylinder 4
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