I have less than 140K on my grand am and I am after replacing 5 front wheel bearings. Once because ABS and ETS lites on in dash and 4 for diferent noises. Mechanic assures installed correctly. Any suggestings?

Yup only thing you can do to prevent the bearings from going bad are to stay out of water!

Water and rust is the main reason they go bad. Next reason they go bad is the mechanic under torqueing the nut!