However, there are a few reasons why transmission flushing chemicals should not be used: The theory is that these chemicals will help to loosen up or clean out dirt and varnish from inside the transmission. The vehicle is allowed to run for 10-15 minutes before the flush, in order to circulate the chemical through your transmission. Transmission flushing chemicals are solvents or detergents that are added to your transmission before flushing the fluid. Going from bad to worse: What are transmission flushing chemicals? As long as your transmission fluid is being replaced in accordance with the schedule in your owner’s manual, you’re giving your transmission all the maintenance that it needs. Car manufacturers know how much fluid will be drained out during a normal service, and they have adjusted their maintenance schedules to account for this.
However, replacing 70% of the fluid is not a problem. It’s also true that a flush machine will replace a higher percentage of the fluid most machines advertise about 90%. Some fluid is trapped inside the cooler or torque converter, and can’t be drained out. It’s true that removing your transmission pan or draining your transmission via its drain plug (as your car manufacturer intends) only removes about 70% of the fluid inside. Proponents of transmission flushes will often argue that a flush is a better service because it replaces more of your transmission fluid. Here is an excerpt from a General Motors technical service bulletin that provides their opinion on transmission flush machines:įact #4: A conventional transmission service doesn’t replace all of your transmission fluid. Even if there’s only a small chance of your transmission being damaged by a flush machine, why risk it? Fact #3: Transmission flushes can damage your transmission.Īs mentioned above, a transmission flush (using an external machine) may not be good for your transmission. Flush machines, unless meticulously cleaned out between different vehicles, can also pump a small amount of the wrong fluid into your transmission. Some machines will run the transmission pump dry as they remove more fluid than they add back in. Among other reasons, this is because these machines, (especially when connected improperly) can block or pressurize the wrong passages inside the transmission and cause damage. Most automakers recommend against using an external machine to flush transmission fluid. Fact #2: Car manufacturers recommend against transmission flushes.
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Checking your vehicle’s transmission control module for software updates, (and installing them if required) completes our full and correct service of your transmission. Some transmissions also require certain adjustments while the pan is removed. While we’re inside there, we also clean the inside of the pan, including special magnets that are installed to trap metal filings and debris. Your transmission filter is usually accessed by removing a pan or cover on the bottom of your transmission. In addition to replacing the fluid, this service also includes replacement of your transmission filter, if equipped. This is where we like to illustrate the difference between a transmission flush and a transmission service.įrom our page on transmission fluid: A transmission service involves a lot more work than a flush. Changing the filter is time consuming and messy, but it’s part of the complete job. About 60% of vehicles have an internal transmission filter that should be replaced every time the fluid is changed. However, it neglects the most important part of servicing the transmission: changing the filter.
Hooking up a transmission flush machine is a quick, easy money-maker for shops that perform this service. The transmission pan removed, showing the metal filter inside.
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