Miata Oil Leak? Check your Cam Sensor O Ring.

PSA, don't waste time like I did.

If you have a substantial leak on your Miata, towards the back of the engine. Check the O ring on your cam sensor. Mine was leaking more oil than I thought possible for that location so I pulled the transmission to get a better look. Nope, just the cam sensor O ring. Flat and completely hard. Took ~$2 and 5 minutes to swap. 

Also, if you search Cam Sensor O Ring on Autozone for a 94 Miata, it comes up with the correct part, but says it's for a thermostat gasket. FEL-PRO #35608 fits perfectly. 

This is an old NA Miata trick. Looks just like a rear main seal leak from below. You are not the first to fall for it. 

In reply to Keith Tanner :

Yeah, once I realized and went looking for that O ring I saw others with the same issue. Just figured I'd bring it to the top for anyone looking. Learn something new every day.