I have used Motor-Up and ZMax in my 1995 C280, and both helped, if any. DIdn't really notice much of a difference on this car. But I believe it won't do any harm, only increase longevity. Although I used to have a1996 Jeep Grand Cherokee and I used MotorUp in it once and it made a vast improvement over smoothness, noise level and power. I would suggest using it. It's a small price to pay for what it can do to your engine.
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2006 E350 w/ 155k miles (Daily Driver)
Previous:
1993 300E 3.2L Sedan w/ close to about 300k miles
2003 E500 Brilliant Silver (Had 217k miles when totalled!)
1989 300E with 289,000 miles (had for <1 yr while in HI)
03 CLK 500 cabrio (Mom's)
2006 C230k (Dad's)
1999 S420 (Mom's/Dad's)
2000 C230k Sport sedans
2001 CLK320 Cabrio (Mom's)
1995 C280 My First Mercedes-Benz... (155k miles. EXCEPTIONAL AUTOMOBILE. Was Very hard to let go of!)
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