I have the original system on a M and it does have the brass valve on the fill cap. Original 2 way valve and quick disconnect. I agree that a raise in ambient temperature would increase the pressure slightly in a closed system. However when the temperature returns to 'normal' it cannot have a vacuum if it is indeed a closed system. If you have ever used the quick connect you know that a small amount of oil will be lost which I think would tend to release any built up pressure. The only thing I'm sure of is you will get your hands dirty. :P
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