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Old 03-08-2013, 07:38 AM
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doru doru is offline
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Location: Calgary
Join Date: Sep 2007
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Mein Auto: 2003 530iA
Originally Posted by ztom View Post
This seems good information. If combustion gas isn't getting in, then the cap doesn't make a difference, it's only a pressure release if a problem. If combustion gas is getting in i.e. cracked head, then the pressure will go the limit regardless of engine or coolant temps, and then a lower bar cap may help by not overpressurizing the system and getting a burst.
........and lower the chances of blowing the head gasket (which is a major +).
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