Part of what Shorebilly said and part of what others have mentioned here. I did a little scratching of my head and looking at the crankcase ventilation and I don't see how the "teakettle" test can tell you much. After all, there is no mention of plugging the normal crankcase vent that connects to the oil separator and then how much is "too much". The "teakettle" test might be a better test of blockage/lack of air flow from the crankcase.

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Sam

84 300SD 350K+ miles ( Blue Belle )