my car has no oil and won;t hold oil after 7 qts. do i have to replace my engine on 2007 Mercedes-Benz R320 CDI

the car stopped while driving. can i have engine damage

Asked by for the 2007 Mercedes-Benz R320 CDI
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Did you notice a puddle of oil on the ground , after putting the 7 quarts in? Does it start up? Is it making strange knocking noise?
no mention of oil on the ground. the car won't turn over with start attempts. engine damage is speculated