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I have a 1999 Mazda Protege LXIT currently has 140,000 miles. I had the transmission fluid (not the transmission filter) in the transmission changed at 110,000. As it is 140,000 now I think that it is time for another service. Also the gear shifts a little hard than before but overall it works just fine. The previous owner also informed me that the transmission failed at 80,000 miles. I am not sure if it was either rebuilt or was replaced as brand new under warranty. But I wanted to ask yo if it is wise to get a transmission service done to such a transmission or just to let it run like it is currently! I do not know if it will start slipping after the transmission service! If you do recommend the transmission service then what kind of transmission service I should have done. 1) Drain and Fill fluid and change filter or a 2) Transmission Flush by the machine I am not sure if the transmission flush machine is reliable enough or will blow seals with pressure or cause other damage in the transmission. Thank you for taking time to answer my question!

Answers from the Automotive Experts

Patty Streeter,  at AskPatty.com Hasnain, Transmission fluid should be at least drained and filled every 15,000 miles. it would not be a bad idea to have the filter changed and then flush the transmission fluid to ensure clean transmission fluid throughout the transmission. A good transmission fluid flush machine uses your transmissions fluid pump (not an outside power source) for pressure when flushing and will not damage seals or create transmission fluid leaks. Make sure you only get this service done at a shop with an ASE certified technician. You can find an ASE certified tech by going here: http://www.ase.com/bluesealsearch/locator.php Good Luck!

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