Thanks for the response. But i can't imagine how "unmeasured" air entering the crankcase from the dipstick or filler cap could affect the fuel injection system, since (1) there's plenty of air in the oil pan already, (2) the oil isn't pumped under vacuum into the crankcase or onto the cam shafts and rockers, and (3) gravity returns it to the oil pan.

In fact, I assume that's why the air isn't measured in the first place; i.e., it doesn't figure into the combustion mixture, unless there's something far more wrong with the system -- e.g. a cracked head.

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1981 380SL
Chassis: R107.045