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The Mazda coolers are aluminum, the stock Porsche oil cooler fittings are metric but ~ AN16 (1 inch).
Its hard to argue that the factory made the oil lines the size they are for a reason and anything smaller would cause too much restriction. But I have seen a logical argument that its Ok to use an AN12 size. I am glad I don't have to decide which size to use. It would be tempting to save the money and go AN12.
The vendors make "weldable" aluminum AN fittings for welding to anything aluminum.
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1994 Lotus Esprit S4 - interesting!
84 lime green back date (LWB 911R) SOLD 
RSR look hot rod, based on 75' SOLD
73 911t 3.0SC Hot rod Gulf Blue - Sold.
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