I too used to think doc fees were as big a rip-off as the service charges at the dealership. Then I had my wife's vehicle in for some service ...... service writer called me to say it needed a new muffler bearing. I said "Whaaaaa ?????" Rushed right down there, he takes me out back to show me.
Now that I see they are honest, I don't second guess them anymore.
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It is a known fact that low taillight fluid will contribute to early demise of the muffler bearing.