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My 2008 Altima sat for 10 months before we finished repairing it and got it back on the road. I was amazed that the tire pressure monitoring system did not show a single tire to be low on air. I keep them at 40 PSI and have never seen them loose more than maybe 1 PSI a month.
My experience has been that when you change tires it's a good idea to clean the bead seating portion of the rim very carefully to make sure there are no rubber fragments left from the previous set of tires.
Seems to make a difference in long term pressure retention, if you actually have the opportunity to thoroughly clean the bead portion of the rims, as well as the area where the valve stem seats on the rim, especially on older cars and trucks.
Slow leaks can be hard to find, but the old sink it in a water tub will still find them if you are patient enough.
regards
Mech
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