Carmax Maxcare Extended Warranty request to authorize expensive engine tear down to diagnois whether covered under warranty ripoff Richmond Virginia

I have only had my car for 1 year and it started knocking. Had car towed to Carmax and they sent to dealer for repair. Before they can diagnois the problem and determine if covered under warranty I must sign an authorization for an expensive engine tear down that I will be responsible for if claim is denied.

Thinking my car was being repaired I called Carmax to inquire on the status and my service Representative did not know anything and told me I could call the repair place that had the car. Is that great customer service or what?

After 3 weeks of calling Carmax and getting the run around,and still no approval for a rental I called the repair place and found out what Carmax could not or would not tell me.

Before they could touch the car I needed to sign an authorization to tear down the engine and I could be responsible for the expense. How do I know that Carmax didn't sell me a car that already had engine problems? They claim to do certified quality inspections but should we believe them? Is buying the extended warranty worth this hassle?

Regina
Ruther Glen, Virginia
U.S.A.