* Over-tightening risk: Impact wrenches deliver significantly more torque than you'd apply by hand. If the plug is already slightly loose or you're not careful with the impact's settings, you risk stripping the threads on the oil pan or breaking the plug itself. Repairing either is far more costly and time-consuming than using a regular wrench.
* Damage to the oil pan: The impact's force could crack or dent the oil pan, especially on older or more fragile pans.
* Difficult control: It's harder to control the precise amount of force applied with an impact wrench compared to a standard wrench, making over-tightening or damage more likely.
* Mess: The sudden force can cause a significant oil spray, making a bigger mess than using a regular wrench.
In short: Use a standard wrench or socket with a breaker bar for much better control and significantly less risk of damage. A simple ratchet and socket is usually all you need. An impact wrench is better suited for much more stubborn fasteners.
