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Can a new AOS be bad? Decidedly yes, we have seen it happen more than once.
The best method to test an AOS, old or new, is with a digital manometer connected to the oil fill cap; if you see vacuum in excess of 5 -6 inches of water (not mercury), the AOS is bad.
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“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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