My 2000 has 70K on the clock and I just did the serpentine belt and still could have gone another 10K. Tires, I see your in the Middle East, gets hot there, so dry rot and break down in the rubber maybe shorten tire life. Me, I would drive it until it really needs tires. As for the oil and water crystal, most likely there is no problem. After a good drive I will usually will have a drop under my car. No big deal. Welcome to 986.
