What is the maximum amount of detergent I should use?

You should not exceed the maximum fill line for detergent, as overfilling can cause early dispensing of fabric softener which could stain clothes. If too much detergent is used beyond the recommended amount, too many suds can occur which decreases washing results or causes heavy load to the motor, potentially causing malfunction. Always follow the detergent manufacturer's instructions.

From the official LG Wd(M)-1080F(H)D / 1085F(H)D Washing Machine manual, page 12

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