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E90/E91/E92/E93 (2006 - 2013)
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  #1  
Old 02-21-2013, 03:09 PM
2011328iE92M 2011328iE92M is offline
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Dealer keeps deflating my tire pressure

It clearly says 39 psi for my rear tires, labeled by the driver's door. Why is my dealer service keep lowering it to 36? Trying to increase my tire tread wear?
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  #2  
Old 02-21-2013, 03:40 PM
Wihelm G Wihelm G is offline
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Quote:
Originally Posted by 2011328iE92M View Post
It clearly says 39 psi for my rear tires, labeled by the driver's door. Why is my dealer service keep lowering it to 36? Trying to increase my tire tread wear?
Interesting. My guess is they have some guy who is paid just to wash cars and set tire pressure to some easy to remember amount. Don't recall the details, but a couple of years ago CARB pushed for some CCR requirement to the effect that, to reduce greenhouse gases or some such, anyone who did any service on a car had to set air pressure to the tire manufactures "recommended rating."

I recall that phrase because I wondered at the time what the heck it meant. If you go the CARB website you may find more details. If it means "the numbers posted on the door" you might want to send an email to the service manager. I have a feeling it means something else because my tire guy regularly puts 40 or 45lbs on each tire, or each car, not matter what the tire or car.

Check this out:
http://www.arb.ca.gov/cc/tire-pressure/faq.pdf

This is why people think California is another planet. That one about it being ok to set the pressure at the "recommended" psi even if the tires are hot is exceptionally ridiculous.

Last edited by Wihelm G; 02-21-2013 at 03:56 PM. Reason: Added ARB FAQs
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Old 02-21-2013, 04:05 PM
mr_bean mr_bean is offline
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There's two different pressures specified. One for a partial payload and one for a full payload and/or high speed driving. Perhaps this is the cause of the discrepancy between you and the dealer.

The owners manual might give you more info than the sticker on the door jamb.

Last edited by mr_bean; 02-21-2013 at 04:06 PM.
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Old 02-21-2013, 04:11 PM
hondo402000 hondo402000 is offline
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all you have to do is when you take the car in tell the service guy to set the pressure to what you want, take a gauge and if anything different go back in and tell them they didnt do as you ask

had the same issue at tire rack, told them what pressure I wanted and they did what I asked

Hondo
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Old 02-21-2013, 07:03 PM
Pasa-d Pasa-d is offline
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How many times could you be going to the dealer that you would even notice this? I've been to the dealer exactly twice; and that's counting the first time to pick up the car.
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Old 02-21-2013, 08:17 PM
fb88 fb88 is offline
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Did you measure the psi before and after? if run hot is at 39 after few hours it could cool down to 36.
Also my 330xi rear is 36 psi, so the guy might have it confused thinking they are all 36 psi...
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Old 02-22-2013, 04:34 AM
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CALWATERBOY CALWATERBOY is offline
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Quote:
Originally Posted by Wihelm G View Post
Interesting. My guess is they have some guy who is paid just to wash cars and set tire pressure to some easy to remember amount. Don't recall the details, but a couple of years ago CARB pushed for some CCR requirement to the effect that, to reduce greenhouse gases or some such, anyone who did any service on a car had to set air pressure to the tire manufactures "recommended rating."

I recall that phrase because I wondered at the time what the heck it meant. If you go the CARB website you may find more details. If it means "the numbers posted on the door" you might want to send an email to the service manager. I have a feeling it means something else because my tire guy regularly puts 40 or 45lbs on each tire, or each car, not matter what the tire or car.

Check this out:
http://www.arb.ca.gov/cc/tire-pressure/faq.pdf

This is why people think California is another planet. That one about it being ok to set the pressure at the "recommended" psi even if the tires are hot is exceptionally ridiculous.

Roger that - and a big thumbs up to you, sir.
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Old 02-22-2013, 05:07 AM
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David1 David1 is offline
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A lot of places will adjust the tires when warm or hot making them low when they cool. This a basic thing that most techs or lube places do not care about. My SA knows to put on the order do not touch tire pressure since I have them set for my driving style.
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Old 02-22-2013, 11:53 AM
2011328iE92M 2011328iE92M is offline
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Quote:
Originally Posted by Pasa-d View Post
How many times could you be going to the dealer that you would even notice this? I've been to the dealer exactly twice; and that's counting the first time to pick up the car.
It just so happened that I've washed my car and checked my tire pressure few days before. And on the dealer's work order, it did mention that they've adjusted tire pressure to 32 front, 36 back. Hope I'll remember to remind them not to mess with the tire pressure next time. It is most likely that they have 32/36 stuck in their head, but it's not that hard to check the label by the door...
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Old 02-22-2013, 11:55 AM
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furby076 furby076 is offline
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Write a sticky note and keep it on the dash.
For my 330 it's 32/36, so maybe for older rides it's that amount?
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