Quote:
Originally Posted by Tomcat_F15_STL
Transmission fluid has a massive volume expansion as temperature rises. That advice amounts to telling somebody they don’t need to pay attention to the manufacturer of a very expensive transmission.
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Massive eh? Does it foam up?
Here's a sample quote I found on internet.
Quote:
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. MIL-H-83282 oil has a coefficient of cubical thermal expansion of 0.00046/°F. Thus a temperature rise of 100°F will increase a 2.0 gallon volume by 0.09 gallons .
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As you can see, fluid barely expands. And if you know how an automatic transmission works, you'd know the fluid just sits in the pan like a bath. And the pickup tube is on the bottom, where the fluid gets sucked in by the trans pump.
The extra oil in the pan acts as a reserve. So the fluid level going up or down a bit has zero effect on function.