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Ok, makes sense - thanks! I thought the caps for Nitrogen filled tires had "N2" to indicate nitrogen... also, when did this become an option on the X2? I did not get charged but it is not listed anywhere on my build sheet... My BMW dealership does offer free nitrogen tire fills so maybe will stay with nitrogen filled. One thing that always happened at least once a year during the first sign of cold weather with my past BMWs (2012 550iX and 2018 340iX) is that every time temps fell below freezing, the TPMS would always indicate 'check pressure'... happened with the MINI Cooper S also... back in 2008 I was told using nitrogen would remediate the issue but I think nitrogen filled tires was not as common and I would need to purge the tires and BMW charged for nitrogen filled tires.
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