Are you tired of unexpected mechanic bills draining your wallet? The truth is, most major car repairs are preventable. With a few consistent maintenance habits, you can keep your vehicle in top shape and avoid those costly surprises. Here's how. 1. Change Your Oil Regularly Oil is your engine's lifeline. Skipping oil changes leads to engine sludge buildup, overheating, and — in the worst case — complete engine failure, which can cost $3,000 to $10,000 to fix. Most vehicles ne