Front passenger tire had previously been patched from nail by dealership in Aug '16. 2 months ago (Dec '16) it gradually started to lose air. Dealer rechecked & wants $162 for new tire. 2nd mechanic said it was stem valve core not tire so he replaced that. It still loses air. Each day I bring it up to 35 pounds of pressure & the next morning it will deflate to 12-17. I feel like it may not be the tire (tried soap and water method) & find no leaks anywhere. I hate to buy a tire if that's not the problem. If needed tire is P205/70 R16. Ideas?
My car has 20835 miles.
My car has an automatic transmission.
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