The kind they issue internally at car companies acknowledging the presence of product faults but don't disclose to the public. Also, is there a source for hidden warranties that are offered when customers take complaints further than the auto companies would like them to? Reason is that when an ingnition module went on my Mustang, it cost me almost $350 to replace it, being out of warranty. What a shock when it goes! The car starts bucking like it suddenly has zero gas in the cylinder! A mechanic remarked that it was a known design flaw. I don't know if that is true, but a friend just had the same problem hit him.
-Rich