The Michigan Motorsports LS/LT Dipstick Tube O-Ring Seal is a precision-fit replacement for the factory O-ring found at the base of the dipstick tube in GM LS and Gen V LT engines. Over time, the stock seal can crack, flatten, or harden — leading to oil seepage and vacuum leaks. This premium replacement O-ring restores a perfect seal to ensure your engine stays clean and leak-free. Manufactured from high-temperature, oil-resistant rubber, this O-ring provides long-term elasticity and sealing performance under extreme heat and vibration. Designed to fit both Gen III/IV LS and Gen V LT engines (1997–2018), it offers a factory-correct fit on both stock and aftermarket dipstick tubes. Whether you're servicing a daily driver or building a performance engine, this is the simple and affordable fix to stop oil leaks for good.