hey guys,
the other day i checked my tire pressure and noticed it significantly lower than the requirements written on the inside of my door. I also noticed a discrepancy between the inside label and my manual.

Which one do I use?

I have a set of bridgestone run flat tires for my 545i sport.

 

I'd go by the label on the door. Early on, they had a label that listed a table of tire sizes with little geometric shapes or symbols to help identify the right pressures for a given tire and load. I'm guessing that many people were so confused by this label that BMW ended up using a fairly simple one to help clear up some of the confusion.

If you do some searching here, you'll see tons of information about "proper pressure" but here's just one thread where both door jamb labels are pictured:
http://forums.e60.net/index.php?showtopic=4695

 

my 05' 545 says 36 for the front and 42 in the rears, 42? this is my first bmw and i have never seen or heard of 42psi before.
Anyways, im running dunlop rft's with 36psi in front and 40 psi in the rears at the moment, is this too much or should i go lower ?

 

After playing around for a while I settled on F-35 / R-37 for the stock Dunlops.

 

im confused, maybe i should call discount tire? what do you guys usually have for your potenza run flats?