When I took the car in for a warranty claim on the new engine, the dealer service manager made a big deal of whether the engine had ever been run on "biodiesel". I do not know if he meant B5 or B100 but it was clear that if it had been used, then no warranty coverage would be available. I believe-but cannot prove-that ULSD caused a bit of leakage in the IP seals but certainly not the crack in the head.

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87 300D 265Kmi
Factory rebuilt crate 603.96x engine at 200K