Believe it; its a factor of engine design and ever improving oils.

FSS on my diesel with my freeway miles always lets me go the 16K max it is programmed for. When tested, its M1 has never had less than 50% of its TBN remaining, more than a trace of soot and shows virtually no fuel contamination. It doesn't use a fleece filter.

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Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)