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1. Crankshaft front seal - most likely
2. sump gasket

Cheers

Camshaft seals possibly also.

Most likely the crank seal - its not a gasket. Clean the area thoroughly with degreaser and re examine so see if there is evidence of where it comes from.

Do you know if the timing belt and all that has been done before? How many kms on your motor? Might be worth doing if its close to time...

There is nothing in there that can break that wont leave you at the very least stranded.

Dann

I would have thought that it if the crank seal is leaking and is not going to improve then you replace it. I don't see any logic to waiting at all. If I am not mistaken you can replace the crankshaft seal by removing the crank pulley removing the seal and replacing it without having to touch anything else .. Right / wrong

Removing the crank pulley necessitates removing the intake, the swaybar, the air con and alternator belts, the ignition leads, the cam cover, the top timing cover the middle timing cover, the bottom timing cover and the timing belt. At that stage you might as well remove the cam gears and replace the cam seals, and then undo 8 more bolts and swap the water pump, the pulleys and the timing belt.

Did you buy the car from someone on this forum? May be there's more info on here about when timing belt & water pump were last done. As a guide Mazda recommend MX5 timing belt & water pump are replaced every 100k kms.

I thought mine was the crank seal but it was still the camshaft seal. There's only one place for the oil to go and its down so thats where you see it
Also theres a spot on the motor looking at it from the side, that is the backside of all the stuff on the front of the motor, and if you see oil there then that will suggest camshaft seal too, its a higher point than where the crank is.