I don't know this for a fact, but I suspect they can't be 100% sealed as they probably need to out-gas when it's hot outside. But that's just a guess. If that is the case, you could seal them and have a check valve, but given manufacturing tolerances, I wouldn't expect an American-made car by the Big Three to be absolutely trustworthy.
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timeasmymeasure
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Date: 2023-09-05 04:36 am (UTC)I don't know this for a fact, but I suspect they can't be 100% sealed as they probably need to out-gas when it's hot outside. But that's just a guess. If that is the case, you could seal them and have a check valve, but given manufacturing tolerances, I wouldn't expect an American-made car by the Big Three to be absolutely trustworthy.