Tip & How-To about Cars & Trucks

When NOT to change your transmission oil.

This is from our transmission shop and many others like us: If you have not religiously changed your automatic transmission fluid every 30,000 miles, STOP - DO NOT Change the fluid or filter, not only is it a waste of money, but the old fluid has 'particles in suspension' (clutch disc fibers), and when you replace the fluid you are removing those particles, of which, the clutch discs now need for internal engagement (when fluid is not changed regularly). This supporting fact comes from many reputable transmission shops (including ours), that have found out throughout the years that: "If you DO change the fluid on high mileage automatic transmissions that have NOT had transmission oil changes on a regular interval as described by the OEM's,(Original Engine Manufacturers) suggestion; transmission FAILURE will result within 1 to 6 MONTHS of further use." Save money and heed this warning!!

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When to change automatic transmission gear oil

The auto transaxle/differential fluid and filter should be changed every 30,000 miles or 24 months. The transaxle fluid and differential lubricant use the same Dextron III automatic transmission fluid. If you have a three speed automatic transaxle, the transaxle differential has a separate lubricant supply that should be checked every 15,000 miles or every 12 months. By the way........ see if there is a Half Price Books or other used book store in or near your town. I find used repair manuals like Hayes or Chiltons for $8.00 or less all the time. Hope this helps. Dano

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My friend, there is probably nothing you can do to fix this ... this is a job for a transmission shop to repair.

Thanks for your interest in FixYa.com

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I have seen many of these cars come in the shop with over 200,000 miles with the orignal trans.

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It is a proprietary Hyundai transmission fluid. Don't use anything other than the Hyundai stuff. This fluid has superb lubrication properties, but it breaks down much quicker than the specified 30,000 mile fluid change intervals. I highly recommend having both the fluid and filter changed once a year or once every 15,000 to 20,000 miles.

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