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View Full Version : What trans fluid is recommended??

89fc3s
12-08-2010, 01:02 PM
My N/A tranny has a lot of miles on it. It grinds downshifting to second. What fluid is the best for these boxes??
My5ABaby
12-08-2010, 01:11 PM
Most people like to run a good synthetic such as Redline or Royal Purple.
Pete_89T2
12-08-2010, 02:17 PM
My N/A tranny has a lot of miles on it. It grinds downshifting to second. What fluid is the best for these boxes??

I've been a happy user of Redline synthetic gear oil with all of my manual transmission cars for many years. For an FC, the proper Redline flavor to buy is MT-90, which is their 90 weight synthetic lube that best matches what the Mazda FSM calls for. You'll need to buy 3 quarts, and will have some left over. Don't know if it will solve your grinding problem, but it probably can't hurt.