Medium and Heavy Trucks
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Thanks for asking your question. I will try and help you out.
No it does not need to be an SAP. There is no difference in the WAX, SAP, or KAL.
Cat made thousands of C7 engines. The reason there several serial number prefixes is cause they ran out of numbers. They can only make 99,999 of each. So when they got to KAL99999, they started with WAX00001. When they made 99,999 of them. They went to SAP.
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