Yes it is 25 Nm. There is a TSB out there warning you not to over torque this as it will not only damage the cap, but it also will stress the oil filter tower mount to the block.

Also don’t fool around with a strap wrench, just get the cap wrench, the decent cast ones are less than $20 on Amazon. Don’t get the cheap stamped ones they don’t grip as well.
This way you can also use your torque wrench when installing to get it tightened to exactly 25 Nm.

__________________
The OM 642/722.9 powered family
Still going strong
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)

both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech