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Is transmission flush necessary

Updated: 10/21/2022
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14y ago

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It is VERY important to consult the manufacturer first! You can completely destroy the transmission if you have it flushed in some cases.

Good example - I have a Volvo, and the manufacturer specifically recommends you do NOT change or flush the fluid UNLESS you over-use the transmission (towing extreme loads, taxi type driving, etc). Even in those cases, it is recommended to not bother changing the fluid unless it smells burnt, or is harshly discolored.

The reason you don't want to flush the fluid (in most cars) is because it will remove sludge and debris that the AT collects over time. I realize that would normally sound like a reason to want to change the fluid, but the trans actually starts to depend on this extra sludge material to operate properly. In fact, most manufacturers design it to do so. If you have the fluid flushed, not only will it remove most of this material, it will disperse the material into crucial parts of the trans, that could be destroyed.

NOW, on the other hand - if the manufacturer recommends you RENEW or REPLACE (keep those words in mind - I did NOT say FLUSH) your Transmission Fluid, make sure that it is done at the specified service intervals. If you were supposed to have replaced the fluid 50k or 60k ago, replacing the fluid now could negatively effect it's performance - and in worse case scenarios, destroy it.

The automatic transmission is a very very tricky and expensive thing, so unless you are having problems, I would avoid messing with the fluid.

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