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I don't know much about third gen's, but I think the following would apply:
You need to find out how bad the leak is. Jack the car up and inspect the pan area. Is it dented or have any visible signs of a leak? If the pan is dented- you'll need to take it off and make sure it isn't warped. If you can see it ruptured (very rare) you need a new one.
If the pan is ok- Clean the oil pan and surrounding areas with some purple power castrol or simple green (don't get purple power on painted surfaces). Start the car, run it for a while (like all day or a few days) and get back under it. Find out where it is leaking and how bad. If it is just seeping between the block and the pan do the simple fix. Get a Mazda oil pan gasket and find the tourqe and bolt sequence specs and replace it yourself. Not hard to do. Just make sure you drain the oil entirely, scrape off any old gasket material on the block and your pan. I don't use gasket sealer on oil pan gaskets but some folks may differ. Also- inspect your pan for any warps or checks at this time. I simpy run a metal straight edge across and sideways and visually look for any 'light'. If no warps you're fine. Any warps- you need to get a new oil pan.
If you clean the oil pan and surrounding areas and notice oil coming from someplace other than the pan, I would take it to a shop and have them inspect it. Or- log on to the RX7club.com and go to the third gen section- they can prob help you out more.
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