New Price! HEMI 5.7L V8 Multi Displacement VVT, Power Sunroof. 2010 Dodge Challenger R/T The Watermark Warranty Forever is valid for as long as you own the vehicle & for an unlimited time, unlimited miles. How much is it? Zero. We're building "Customers for Life" so the Watermark Warranty Forever comes standard with every qualifying vehicle meeting the criteria and is included at no extra charge. There are no catches, hidden fees, or gimmicks. Our dealership provides this product as an added value to our Customers for doing business with us.