Refill closer cylinder oil

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The fluid in an LCN closer must not be refilled in the field. See attached Warranty and Repair Communication 
The 4040/4041 closers have been replaced with the 4040XP closer. The 4040XP cylinder replaces all the older versions. There are 2 cylinder "only" option's for the 4040XP series. The 4040XP-3071(...
The Date Code and Closer Size are stamped in the backside of the closer body. Closer Size: If the number is "1", the closer is a 2031 or 5031. If the number is "3", the closer is a 2...