Quote:
Originally Posted by Flying Ace
It could be both. I would refer to the manual. There's an entire matrix of recommended tire pressures depending on tire compound type, anticipated speed, wheel size, and vehicle load
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If you enter the proper tire type in iDrive, the computer will make a valid recommendation on what your ideal tire pressure is for them when at their current temperature. The pressure WILL change, even if there's no leaks as you drive them as they'll get warmer, raising the pressure, and as the weather changes.
The tire's pressure must drop a certain amount before the logic will trigger a low tire pressure alert. It's not uncommon this time of year to maybe get an alert when starting out with cold tires in the morning and have that alert go away as you drive when the pressure rises because of the tire warming. That is a signal you really should adjust the pressure for the current conditions as it affects wear, safety, and comfort.