Quote:
Originally Posted by BYprodriver
The low tension piston rings rely on the crankcase vacuum to help seal the rings, eliminating that vacuum increases blow-by. If the AOS is disconnected from the vacuum source no oil will come out the top of the AOS.
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Along with blow by and he loss of effectiveness for the low tension rings used in these engines, not having vacuum in the case sump will lead to increased water and fuel level build up in the oil as the low vacuum level created by the AOS helps to flash them off at lower temperatures. This will very quickly degrade any oil.
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