I have a '95 DeVille. Bought it with 48K miles. It now has 147K miles. I love the car. It still looks and runs great. In this 100K miles I've replaced the water pump, idler and beltthree times.I always add water pump lubricant. It's nowclattering once again and needs it for the forth time. I'm changing the water pump more often than the spark plugs. It's not that it's so expensive but it's a real pain. Any idea what gives?