Review on ACDelco RC27 15 P.S.I. Radiator Cap: Genuine GM Original Equipment by Aaron Ayo

I bought this cap as a first step in finding out why my mother's 18 year old Buick was losing coolant. No trace of coolant on the radiator or anywhere else in the engine compartment, no odors or fumes, no puddles under the car. Just a low level of coolant in the radiator and coolant expansion tank. I took off the old factory cap, filled the radiator and installed this new cap. There was no more coolant loss within 3 weeks of installing the new cap. The problem is solved? The time will show. The cap I received is exactly the same as the one on Revain's product description page. Exactly the same cap that the factory installed on my mom's car.