Had car in for checkup told transmission needed service,is their a factory lock
Most personal vehicles with normal driving (NOT commercial, high mileage, rough service) should have the automatic trans serviced every 25,000 to 30,000 miles for maximum life expectancy. The first time service is performed, the filter(s) and all the fluid should be changed. The second time, it is acceptable practice to only replace the fluid, then the third time replace both the filter and the fluid and repeat this procedure indefinitely. Most all automatic transmissions retain between 50% & 75% of all the fluid in the torque converter which no longer have drain out capabilities but can be flushed out with the use of a flushing/exchanging machine. (Some vehicle transmissions are sealed and require either special adaption to service or are simply difficult to service as they have NO filler or dip stick) Make certain to use the proper type of specification fluid as there are various specified types. The only automatic transmission fluid that I am aware of which is compatible with most vehicle manufacturer's is made by Amsoil and they guarantee it. I personally have used it on many vehicle including all my own, some of which are in rough duty service and it has performed as advertised.
It is true, that if/when an automatic transmission has never been serviced and has excessive miles on the fluid (fluid is very dark and smells bad) a potential transmission failure can occur shortly after replacing the old fluid & filter. This is due to the the fact that old fluid has created varnish or sludge inside which is basically keeping the unit functioning. When the new fluid is installed it cleans away this varnish/sludge and the internal hydraulic pressures drop off, thus the transmission ceases to function properly. So sometimes, if you have let it go to long..(70, 80, 90, 100,000+ miles)..it might be best to just keep driving and save your money for the eventual overhaul that will soon become necessary. Oh....and don't forget that brake fluid should be changed every once in a while also....WHEN? Well that is a topic for another post! "Happy Motoring"
Jun 01, 2009 |
2007 Nissan Sentra 2.0 SL Sedan