[clueless69]

hi.all title say it all because it is funny(i mean not funny anymore)tires loosing pressure there is no logic sometimes never get error message for tire pressure malfunction in month i do drive like 50 miles a month. yes i did measure pressure with oem bmw digital gadget and it show corect side what the vehicle say.can it be bad or old valve core.i have plastic caps. i did balance my all tires,was trying go cheap but some shops dont have required equipment even get wheel on balancer. so i went to goodyear they spend an a hour and they say cant find any leaks.did anyone had familiar problem.thanks