flushing is not something I would do. It will not magically fix MPG issues. It may possibly kill your running engine.
1) clean oil and filter
2) new fuel filters
3)check pump timing
4) replace worn nozzles
The sludge you are thinking about is just laying there in valve covers and low spots on the head, minding its own business. IF you do manage to dislodge it, chances are good it will go somewhere that will do harm.
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2007 Dodge Ram 3500 SRW 4x4 with 6MT
2003 TDI Beetle
2002 TDI Beetle
currently parked - 1996 Dodge 2500 Cummins Turbodiesel
Custom cab, auto, 3.55 gears
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