DHS

I have been driving my '09 S5 for about three months. Seems that I can not keep the tires properly inflated - 39 in the front and 36 in the rear per the door placard. I check it every week and find that the fronts are down at least 4 pounds and the rear a couple. I am testing when tires are cold for consistency. Is this an issue common to 19" wheels or low profie tires? Or maybe it is just the crappy roads I drive on in Maine. Anyone else?
David

titanium11

Not usually, use some soapy water and spread it around where the wheel and tire seal, look to see if there's any bubbles. If so, it could be a bead leak.

a5sport

Good idea..but if the leak(s) are on the inside of the wheel(s), he'll have a hard time finding it/them.

If he has separate mounted snows, put them on the car, then take the summer set to a brand name tire store, & have them submerge each wheel in a test tank. A definite PIA...but may be the quickest & best solution.

JGA5Cab

if you look in your manual, you will find that there is a tire pressure recommendation for lighter loads (one to two people). The door placard has a fully loaded rating. You can lower your pressures for a better ride. I know that this wasn't your issue but I found my car to ride better and go straighter with less pressure.

DHS

Excellent suggestion (and from a guy with my car's color twin). It is only me in the car 90% of the time.
Obliged.
David

JGA5Cab

You're welcome!