My D2 PF S8 engine was just as clean when I took it apart with 124k on the clock without any special cleaning and very clean in combustion chamber as well.
About Ed chinas Jag, it's 2 years younger than my S8 and he had 0.65% CO and 500ppm HC before cleaning at idle speed. After clean it was 0.55% CO and 78 ppm HC. For comparison my S8 in last MOT did 0.00% CO at both idle and fast idle and 8ppm HC at fast idle(not tested at natural idle for MOT), a lot better then Jag even after clean. Jag might have different emission limits for MOT but for my S8 CO limit is 0.3% at natural idle and 0.2% at fast idle so by the S8 standards Jag would have failed MOT even after clean. HC limit for my S8 at MOT is 200ppm.
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Currently 8less
2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D
8 history:
2006 A8 Sport 4.2TDI quattro SOLD,
1997 S8, reached end of life with gearbox failure
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