O-Ring CAS/Cam Angle Sensor - FITS MX-5 MK1 All models 1989 to 1998. - On the 1.8 MK1 MX-5 if the current seal is leaking, it can drip oil onto the heater hose at the back of the engine. - This is a Viton 75 Shore O-Ring and can withstand higher temperature compared to other Nitrile Buna Rubber O-Rings that are on the market.