No oil filter?!

Hi I'm a new MB owner of a 1974 240D automatic. Like all vehicle I buy I change the filters as soon as possible after purchase. I believe the oil filter canister would be behind the injecter pump on the driver side of the motor, but alas no oil canister. The previous owner told me that he had put in a newer used motor after the first one blew. It runs like a top and doesn't have any problems but can anyone tell me where the filter is located. ! Thank you for your advice and help. Troubled MB owner.

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