The best analogy of this situation I've heard is the comparison to taking your own meat to McDonald's and asking them to make you a sandwich with their other materials and bun and your meat!
As Rob said, if it is a warranty you sold, then you should probably be already aware that in the fine print of their contract they reserve the right to ship parts to you to install. You accepted that as a condition when you agreed to sell that particular warranty. If it is not a warranty that you sell, then by all means let the adjustor or rep of the warranty company know that:
A) You are doing them and their customer a favor to honor their warranty (and possibly taking a chance on getting paid in anything resembling a timely fashion)
B) Your shop's policy is that you do not install parts not purchased through your own parts / service departments (this also gets the warranty company off the hook for a second claim if there is a part failure under the replacement part warranty).
C) When a customer comes to an OEM dealership for repairs, that customer's expectation is that he will be receiving OEM parts for their repair as you state in all of your ADVERTISING.
If the vehicle is down and you have tear down and/or diag time invested, sometimes you just have to call their bluff and tell them to provide you with a credit card for payment of current charges and THEY can then make arrangements to have the vehicle towed elsewhere for repairs; and that you will be advising the customer exactly why we are not able to repair their vehicle according to the LESSER standards of the warranty company.
That being said, like Rob said, you have to look at each situation on it's own merits. You find out pretty quickly which of these warranty companies are worth doing business with and which ones are not. The reason so many of them try to ram these parts and assemblies down our throats is because we let them. Unless your shop is starving for work, passing on such a repair is sometimes better than spinning our wheels for little or no profit and the inherent payment problems and core return problems that accompany them.
Scot Strong
[This message has been edited by scotstrong (edited 11-22-2004).]