I’ll add a few comments: Sometimes older winter tires perform poorly, even though they have decent looking tread. The rubber compound can get stiff with age and become less pliable, rendering the tires ineffective in cold weather. I don’t know how to tell when a winter tire has gone past the useful life, other than how they feel and perform. I typically use mine for three seasons and then replace them. I’m not saying that your tires need to be replaced, but you should consider it if you install them and the car doesn’t seem to perform well.