i just had this problem on my last mustang. the rims do oxidize and deteriorate and this causes the rim to leak where the tire touches the rim. they put a sealant around the bead of the rim and the tires have held air for years with no problems. you would be surprised how many older style rims this treatment has been done to. i have done this myself when i used to work at a goodyear dealership. later mark Noah wrote: > So, the tires on the left side of #2867 are hemorraging air (the front > worse that the rear). Analysis reveals that the air is seeping through > between the tire and the rim. The shop has suggested unmounting the tires, > and remounting them with some sealent