The majority of original Mazda oil cooler lines installed from the factory are leaking by now.  A quick visual test will show if the oil cooler lines are wet with oil.  Oil leakage is typically from the crimps between the metal hard line section and the softer rubber hose.  It is recommended to replace these leaking oil cooler lines ASAP.  Replacement oil cooler lines are offered from Racing Beat and Cork Sport.

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