Due to the very high temperatures and constant heat cycling the OEM screws encounter, the flimsy plastic will become brittle over time.? With almost 100% certainty, the stock screws will strip or break resulting in a coolant leak and an undrivable car if they are not replaced.??ECS Tuning has you covered we designed?precision machined 7075T6 billet aluminum bleeder screws that will last a lifetime!??