Thanks for your help. I searched "W140 Maintenance" and found much needed information. I am finding this decision difficult as my research has shown Maintenance costs much higher than my expectations. To my surprise, I've noticed many complaints about the W140 chassis's reliability. On the same token, most complaints were followed up with praises and admiration for their cars and feel the extra output is well worth it. Right now, I am thinking of shying away from the W140 for a comparable car that is more reliable. Reason being:

I am a Case Manager for Anthem BCBS out in the field. I spend most of my work time driving to hospitals, private homes, etc to verify personal injury claims. I can't afford to be stranded on the side of the road or have my car in the shop all the time.

Is there anyone else in my situation that has a W140? If so, what has your experience been with the car?