Here's the deal. On a lot of older vehicles, this ';myth'; was a fact. For some reason, it was especially true on Fords. Even more so on the old FMX trannies and C6 trannies. As a matter of fact, some C6es were bad about failing even by doing a tranny fluid change at the recommended intervals. Something about the type material they used to make clutch packs out of, without proper maintenance on the tranny, material byproduct would build up on the clutch packs. Fresh fluid would wash this material out and cause them to start slipping, sometimes even just crapping completely out all at once.
However, there has been great advances in technologies and materials used to build these things. From my experience, on trannies build in the last ten to fifteen years, this ';myth'; has become more and more rare to actually happen. Still, if you've allowed your tranny to go a hundred grand without proper maintenance, it's a crap shoot. After that many miles of ignoring your trannie, I don't believe you can actually blame a failure on maintenance that should have been done long ago.Why not change transmission oil after 100,000 miles for the first time?
Ok, it will not ruin your transmission to change it after 100,000. There is a popular myth that after 100,000 miles of neglect and abuse, that the fluid itself has so much of the friction material from the clutches in it that removing the fluid will remove the material that is keeping the trans working. This is garbage. The point of changing the fluid is to keep the valve body of the transmission clean and the clutches free of debris. Just change your fluid. You are actually prolonging the life of your transmission. Good Luck
That is so incorrect.
Here's the deal. The tranny oil should have been changed every 30k miles. Some people don't change it and BY LUCK make it to 100K miles. Then they do a tranny oil swap for the first time at 100K miles. Then the tranny breaks down.
SO they go screaming that the OIL CHANGE caused the failure.
NO !!!!!!!!!!!!
The first 100K mile on dirty oil caused extensive damage. At that point the tranny was already damage and was going to break down - it was only matter of time.
Good Luck...
Ususally done around 50,000 miles. Oil get dirtly. The dirt whate cause the damage. That why the fittle is change. It can only stop so much before it stops up.
That not rules that say the transmission die if you change it at 100,000 miles. Some will die if you service it or not. Because the dirt was a seal. If the clutches don't get oil at the proper presurer then they will slip. This slipping wear down the clutchs adding to the dirt. Car that are HOT ROTed usely go down hill with a build-up slided and burn oil. They need service more often.
as the atf ages it develops a vanishing capability. this build up on the clutch packs and every where else. if you replace the fluid, you will replenish some of the detergents in that fluid. this will give the fluid a capability to wash away the varnish on the clutches increasing the clearances in them giving you the slipping issue. it is not a myth at all. i have seen it happen.
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