"Back in the day" a common de-carbonising method was to run the engine and slowly pour Red-ex (upper cylinder lubricant) into the intake until the voluminous clouds of black thus created dissipated. I never pulled an engine down to do a before/after comparison but this method certainly produced vast amounts of black smoke which eventually dissipated
Deano
66 SIIA SWB .......73 SIII LWB diesel wgn
86 RR 'classic'......99 Range Rover P38a
94 Defender 110..95 Defender 130 Ute
96 D1 300TDi.......99 D2 TD5 (current)
04 D2a Td5..........02 Disco 2 V8
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