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Originally Posted by Steve Tinker
A real easy way to check if your AOS is leaking is to try and remove the oil filler cap with the engine idling - if the cap is difficult to remove, ie there is a vacuum holding it closed, there is a good chance that you have an AOS replacement in your near future....
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If you feel this vacuum Id just change it over, its not expensive to do and saves alot of embarressment when it goes at the supermarket and you leave a mushroom cloud behind you when you drive!