I had a similar slow leak in one of my old tires. Took a good 20 minutes to find it. Nail was under the tread and not visible. Bubbles were the smallest I ever seen. If it's not a puncture then either valve core, valve stem, or rim bead leak.
Had a valve stem leak on a different car, valve hole had rust and stem was not sealing good any more.
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G37S Sedan 6MT, Eibach swaybars, Invidia Exhaust, Weaker Clutch Pedal Spring
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