How do I know if it’s safe to change my transmission fluid? I have a 2010 Honda Civic with an unknown vehicle maintenance history—though the CarFax says trans fluid was changed about 5 years ago. It’s got about 150k miles on it. How do I know if it’s safe to change my fluid? I don’t want to change it and then have my transmission slip. I do have a dipstick, but I’m unsure what else to look for aside from color.
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