Replacing parts does not lower the products standards. It is the same unit even enhanced and improved with something new. It can be comparable to a turkey filled with stuffing for Thanksgiving. It is the same fowl animal with something better inside. The outer covering remains the same despite changes inside.
It is therefore essential for a consumer to maintain the washing machine whether it is old or new. Remember that washing machine has many moving parts as can be seen. Moving parts will cause wear and tear. Similarly the temperature of water also causes impacts on the parts of the machine. Detergents, bleaches and softeners used for washing have acid contents which will react with certain parts of the machine especially metallic parts. Residues formed after the washing process may get deposited in different places in the interiors of the machine.