Stop in for a cup of coffee

So im thinking i want to change a few things as far as my shop/ business goes.
Im raising my rate for oil changes,labor is not enough for proper inspections.Basically im charging for 20 minutes,but spending 40 minutes or more.
I understand im looking for more work through the inspections,but newer vehicles rarely need anything.

That makes sense to me, add value in the new rate with "19 point inspection" or however many, would think customers would go for that.