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Running non oem coolant temp sensor


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How important is it to run a oem temp sensor? I really wanted to try a temp sensor and got one from a local parts store. It says made in italy. I am noticing my fuel economy is not nearly as awesome as it was before I changed the sensor. Is it possible a leaking oil breather line could create a noticeable fuel economy issue to? Can I try using my temp sensor from my n/a 93 legacy on the 94 legacy turbo? The one I put on the 93 was very recent and OEM. Any input would be great.

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