Have tires on my car that were bought from Costco. One has a leak...would lose 5 psi/day. Don't see anything on sidewalls.
Called Costco Tire Dept a few times but no answer (probably cuz they are busy). When do they open so that I can go there first thing and get first dibs for them to look at the leak? The last time I went, they were opened at 6 am...then again, that was during tire changing season.