My best advice would be to put in 8-9 liters, try to find a friend with an IR thermometer and use the dipstick to get the level exactly right.

Mercedes is picky about getting the level exactly right, I would not want to run the risk of putting 9.5 liters in without measuring since you may run the risk of overfilling.

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Ali Al-Chalabi

2001 CLK55
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record