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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Wheels and Tires Forum Sponsored by The Tire Rack > Air Pressure Retention in Run Flat Tires



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      04-27-2008, 08:47 PM   #1
Sailor
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Air Pressure Retention in Run Flat Tires

I took delivery of my ordered '08 328i on November 7, 2007. To date, the pressure warning system has signaled no pressure loss in any of the tires. I'm unaccustomed to going so long without adding air to tires, but I realize that the thicker side walls of the run flats may slow pressure loss.

Am I missing something about how the BMW pressure monitoring system works and should I start adjusting air monthly (as I do for my other cars), or wait until the car tells me to do so? I've noticed no degradation of handling over the months that I've owned the car; it still feels perfect.

Thanks
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      04-27-2008, 08:48 PM   #2
aut0sh0cker
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just check the pressure with a gauge... if it is low, fill them. so far i have had to fill them twice since december...
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      04-27-2008, 11:38 PM   #3
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Quote:
Originally Posted by Sailor View Post
I took delivery of my ordered '08 328i on November 7, 2007. To date, the pressure warning system has signaled no pressure loss in any of the tires. I'm unaccustomed to going so long without adding air to tires, but I realize that the thicker side walls of the run flats may slow pressure loss.

Am I missing something about how the BMW pressure monitoring system works and should I start adjusting air monthly (as I do for my other cars), or wait until the car tells me to do so? I've noticed no degradation of handling over the months that I've owned the car; it still feels perfect.

Thanks
Actually yeah you might be missing something. The BMWs TPMS is kind of shitty in that it doesn't show you actual pressures and only registers significant or sudden pressure loss. In theory your tires could be a good 5-8 lbs low and it's hard to feel the difference with the firm RFT sidewalls.
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