It IS harder to tint the windows in a Benz, to the extent that an MB driver is likely to be more demanding of a quality install, (They will have to take longer on the job), and if they screw up an interior part with their tools, it will likely be more expensive to fix. So they build this into their estimates.
2003 Firemist Red/grey leather SL 500
2015 Palladium Silver/black mbtex GLK 350
1987 Smoke Silver/burgundy mbtex 300E Sportline (SOLD)
Click to see 87 300E