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on both my X3 and my 2008 328xi which also had TPMS, pressure would drop as the temperature drops - sometime in november or december I would have to add air to all 4 tires. Get a real tire gage, inflate as needs in the fall/winter, deflate as needed in the spring (or atleast check it to be sure it doesn't get too high PSI).
I have heard from others with non BMW's w/ TPMS that you need to put some air in over the winter.
Inflate to what the sticker inside the drivers door said, can't recall the PSI off hand.
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2018 X3 M40i G01 | Phytonic Blue | Mocha | Premium+Exec | Driver Assist | Adaptive M Suspension
2011 X3 XDrive35i F25 l Deep Sea Blue l Mojave Leather l Sport, DHP, Premium, Nav/Technology, Cold Weather, Convenience [traded in]
2008 328XI E91 Sportwagon l Sparkling Graphite [traded in]
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