Moderator: volvite
It also gets cold worked, hardened and more brittle every time you compress it with the plug. It's less able to conform to the bottom of the pan and at some point will stop sealing tiny leaks. That's why they don't usually fail by cracking, you just get the annoying tiny puddle of oil that builds up over time.john12121 wrote:No its not necessary to change the drain plug as long as there is no damage to it..The drain plug just closes the hole in the oil pan so that the oil doesn't leak out...