I've used Tire Choice for my car and my golf cart. When my car kept running low on the driver's side front, they took the tire off, ran it through the water/bubble test, sprayed some gunk on it, and re-mounted it. It was great for a week but then it started running low again. A different tech did the bubble test, and found a tiny hole in the valve stem. He replaced it and re-mounted the tire. It's been fine ever since.
The cost: I tipped the first guy $5 and the second guy $10. There was no charge for either visit.
Brought my car in for an oil change. It uses synthetic, so it was around $60. But there was also a $30 rebate. So a full synthetic oil change set me back $30 (plus tip).
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