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For generations, agricultural producers have chosen the superior protection and performance of Cenex Ruby Fieldmaster® Premium Diesel Fuel and Cenex lubricants, to ensure their equipment is protected and ready when it’s needed most. A protection plan like no other, the Cenex Total Protection Plan® warranty covers new equipment for up to 10 years or 10,000 hours and used equipment for up to 8 years or 8,000 hours.