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Fact or Error? Don't change old automatic transmission fluid
My daughter drives an '06 BMW 325i. (Yes, apples can fall quite far from trees.) We do all the maintanence/repairs together. At 120,000 miles it has a less-than-smooth shift habit, intermittent, between first and second and second and third. Shifts slightly hard. Other times normal and smooth.
Fact or error? Changing out the AT fluid will damage the transmission further?
I have heard mechanics I admire, like the YouTuber EricTheCarGuy, say it is a fact (sometimes). My neighbor insists it is true. I do not believe it. I cannot conceive of a situation in which replacing polluted oil that has poor lubricating and heat resistance qualities with new and better functioning oil can somehow do damage--unless the transmission was so far gone already that it was about to fully fail. My daughter's is suffering a mild shift bump, not a major problem of slippage and random shifting and high revving...
Your thoughts welcome...
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See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.
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