You could have a nail or other object that is in the tire. The position
of the tire, temperature, etc., could cause the tire to leak at only
certain times. In addition, the nail could have been further driven into
to tire, causing it to stop leaking.
there might be a ding on the rim somewhere,and when you park with that ding
on the bottom(ground contact),it makes a slow leak.
Also,AL wheels are subject to corrosion on the inside from
moisture,possibly causing a bad bead seal,aggravated when the tire is
left in a certain position.
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