Opinions differ. Some hold out for Sekurit, others (like me) get PPG since it's cheaper and PPG is an OEM.

Had mine replaced 4 years ago with PPG and has served me well. I called my local MB dealer and asked what they did -- they referred me to an independent glass guy who installed it in my driveway (which is nice since the car needs to not be driven for 24-48 hours while the sealant cures).

Might want to check with your local dealer and see what they do -- i.e., do it themselves, or refer to an outside shop?

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Steve
'93 400E