Is car count an issue? How about repeat visits?
In some markets, a free quick check is the norm....scary, huh

One universal truth is that customers do not like to pay for diagnosis. It may not seem that way at your store today, but it is to some extent whether you know it or not.
As mentioned, one of the best ideas is to list total labor charges for services without listing diagnosis as a separate line. People hate that separate line.
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Tom Ham
AutomotiveManagementNetwork.com