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This is a bad idea for several reasons. First, you run the risk of a runaway car. Second, you risk damaging your transmission, which could cause the runaway car in the first place. Thirdly, in newer fuel injected cars, you can actually get worse gas mileage. Let me explain. As stated before, by not having it in gear, you run the risk of your car getting ...


I've done that a number of times while trying to diagnose odd noises that only occur at speed. Nothing bad has ever happened, but those times are all spread across a number of cars, so the times I've done it per car is very low. Could have a cumulative effect? Like @Nate says, it's technically illegal in many places. I can't recommend it as standard ...


If you are saying that they used Dexron III instead of Dexron II, that is completely okay. They are not interchangeable, since Dexron II should not be used in a transmission that calls for Dexron III or something higher. Dexron III exceeds the properties of Dexron II. In fact, the original GM ATFs have been superseded by Dexron III.

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