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Discussion Starter · #1 ·
I searched but did not find an existing thread on this, so if this has been gone over before, absolutely redirect me.
I just had a BMW specialist (not a dealer) in Pittsburgh who is highly rated tell me that if I don't put BMW "star" rated run flat tires on my vehicle, it will burn up the oil and clutches in the transfer case. I just put good Michelins on with all of the same specs as the Pirelli P7s that came on it EXCEPT for not being run-flats. I really did not like the Pirellis and couldn't wait to change them out, but I also don't want to have just burned $1k on tires that are going to break the car. Is there any validity to what this person is claiming? Is it possible he is just being alarmist? Educated opinions please! Thanks.
 

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You need to find a new "BMW specialist " for sure. That person is full of it.
The only reason to keep stared run flats is if you have to return your car when the lease is up. If it's not a lease, you can put on any tire that trips your trigger.
 

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Discussion Starter · #3 ·
You need to find a new "BMW specialist " for sure. That person is full of it.
The only reason to keep stared run flats is if you have to return your car when the lease is up. If it's not a lease, you can put on any tire that trips your trigger.
Thanks. I'm trying to chase down a vibration in the front end (personally I'm thinking a failed tension strut bushing), but my usual shop, who are generally well familiar with euro cars, didn't have a clue. So I looked for someone with BMW specific knowledge, and apparently I've found the far end of the spectrum - this guy seems to be an intense, hard core, BMW purist. I really just need someone who basically knows WTF they're doing.
 

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I had what seemed to be brake rotor vibration in my 2015 328i xDrive and it was not cured by new rotors and pads when I installed them. While doing some warranty work the dealer found bad strut rod bushings and replaced them, and it got rid of the vibration.

FYI - the warranty work was to fix problems with the thermostat. Car did not overheat, but started throwing CEL codes about a thermostat sensor malfunction. I found a TSB about that issue on the 2015.

Bruce
 

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My service writer at BMW of Bubbaville said they had a demented xDrive in with an error code, and it was finally corrected by replacing all four tires with BMW spec's tires. I suspect the breakthrough was having all four tires of the same make and model, not necessarily them being BMW spec' tires.

Although, some xDrive's come with staggered tires that supposedly have the front and rear rolling diameters way off if you go my the nominal rolling diameters calculated by the tire size. Maybe BMW's spec's their tires in those sizes to be abnormal to get a front-to-back match. The moral of this story is that nothing good comes from staggered tires on a smart AWD vehicle.
 

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Although, some xDrive's come with staggered tires that supposedly have the front and rear rolling diameters way off if you go my the nominal rolling diameters calculated by the tire size. Maybe BMW's spec's their tires in those sizes to be abnormal to get a front-to-back match. The moral of this story is that nothing good comes from staggered tires on a smart AWD vehicle.
Our 2014 335 GT x-drive has the optional staggered 19" set up, I did not like the Pirelli run flats for all the typical reasons and replaced with Michelin Pilot AS3+.
Stock tire size is 225/45/19 (F) and 255/40/19 (R) 27"dia.(F) and 27.1"dia.(R)
I went 245/45/19 (F) and 275/40/19 (R) both 27.7" dia. on the stock wheels. Very happy with the results, about 10,000kms so far, wearing very well, no rubbing, no codes, no issues at all.
 
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