Long ago, the rumor was the fender Pentastar denoted the car was bought with the extended warranty. But I have never seen any documentation to support that.
That's a rumor that needs to be dead. They all came with them regardless. Corporate warranty was 5/50 for everything and 1/12 for a Hemi car. No such thing as an extended warranty back then. At 50k miles cars were concidered half used up back then.