It would appear that wikipedia has aligned constant-loss with total-loss . Certain motocycles (think : BSA) had a lubrication system which included a spoon which was used to refill the crankcase with oil , as those engines would leak like a sive .
On the other hand , there are the two-stroke Detroit Diesels ; those are 'Total-Loss' by nature .
By all accounts , the AAR and Trans Am (Challenger) hoods would buckle , bend , warp , etc. , due to lack of reinforcement on their perimetre . Similar to the bending of the hoods of the 1973-1979 GM pickups ; no reinforcement .