OEM Slave cylinders will outlive most "shop brands" and generic brands according to Alex Pfiefer. From what I've experience, it's true. I went through a Raysbestos slave cylinder in 4 months, but I replaced it with a Tokico from nopi.com shortly after, and still no leaks 6 months later.
OEM: Nissan, Nabco, Tokico
Shop brand: Raysbestos, BIB, etc.
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