Go to your local Lexus dealer and look around. Count the number that you see with the heads off due to oil sludging....and that is with proper maintenance.
They all have their problems. The one thing I do see with MB is that they are on the cutting edge and like to introduce new technology before it has been completely sorted out.
I still dont understand why people would want to spend as much money as they do on a Lexus when you look all over it and it says Toyota. Sure, Toyotas are great cars, but when you buy a Benz , you have something special. If it costs a lot to keep up....so be it. As for me, I will pay for the comfort and safety of a car that is of the caliber of a Benz.
To each his own.
Mercedes Benz Master Tech
ASE Master Technician
Owner of "Behind the Star Inc."