Why should you leave the 4 corner bolts when removing the oil pan?

Leaving the four corner bolts in place while removing the oil pan is essential to avoid warping and ensure a good seal. When these bolts are left in their original position, they hold the oil pan securely in place, allowing for a controlled removal process. This helps to maintain the integrity of the oil pan, preventing it from bending or distorting, which can occur if it is removed too hastily or without proper support.

A warped oil pan can create challenges when trying to reseal it later, leading to potential leaks and loss of oil pressure. A proper seal is crucial for the engine's performance, as it ensures that oil stays contained and circulates efficiently. By taking this precaution, the long-term functionality and reliability of the engine remain intact, leading to a successful maintenance or repair process.