We (78 and 73) live in the middle of the city and drive only very little, almost only short distances. However, on the edge of the Alps, but would not drive in any weather. As far as the background to our question regarding Astra H (will be 7 years) with summer tires 195-65 15 inches. The tyre service, where the summer tires store recommends us to buy 2 x still 5 and 2 x 4 mm new. We had already thought about changing to all-year tires (only Goodyear7vredestein should be acceptable?), but there is w ohl this tire size not exactly suitable (I have read, absolutely winter unsuitable, but the winter tyres with respective rims exist. Or are the existing ones acceptable for the expected maximum 4000 km this summer? At least the 5 mm, but did one mix the species, of course not on one axis? Greeting, nest