Tutorial to change the oil in a 5-speed manual transmission on model NA Mazda Miatas. NB / NC are probably similar.
This video describes the process of oil change and replacement of transmission and oil change and replacement in the turret of the shifter.
Be sure to read the owner's manual to confirm if GL-4 or GL-5 oil is needed and choose an oil that meets your car's criteria.
720p HD video.
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Video credits to mazdamiatafan YouTube channel