Can we talk about the "18 wheelers need 18 gears" myth a customer swore was in the owner's manual of his 2019 Freightliner?

Angela Cooper · 2026-10-02T15:30:08.753093+00:00

I had to pull up the actual manual on my phone at the counter in Bakersfield to show him it says 12-speed automated, and now I want to know what other maintenance myths y'all have had to argue about with a straight face.

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Can we talk about the "18 wheelers need 18 gears" myth a customer swore was in the owner's manual of his 2019 Freightliner? | Diesel Mechanics - Librear