If he has free play at the lever then he is good to go for a right good long while with his rod length where it is according to his case markings.   He is at the "good end of things" for rod wear or cable stretch, which generally strongly outweigh plate wear effects anyway.

Keep on using DIESEL OILS, you may have residual friction star materials on your clutch plates that the diesel oil may help clear up for you.

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This user isn't able to communicate clearly enough to figure any thing else to try to tell him.   So, just run it the way it is until it gets better or gets worse.   One or the other is gonna happen eventually.