How many miles on your W211?
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Joined: Feb 2022
Posts: 89
Likes: 34
From: New England
2004 E 500 4MATIC Wagon; 2015 ML 350 4MATIC; †2003 C 240 4MATIC Wagon (2003-2022)
Over 165,000 miles on the 2004 E 500 4MATIC wagon. The car still runs flawlessly. I just left it sitting outside for exactly a month while I was out of the country (and, during the week before that, I had only driven it a couple of times locally). When I returned, I put a tester on the battery to perform a CCA test, and the battery was at about 88%. The car started right up without any issues.
Recent service earlier in the year (discussed in this thread) included replacing the original radiator (replaced with OEM Mahle-Behr); original hoses (upper radiator, lower radiator, and auxiliary water pump hoses); coolant lines; expansion tank and cap; all transmission cooler line and hose segments to the radiator (the original transmission cooler lines were severely corroded, as the car has lived in coastal northern New England...); lines to the transmission; water pump; thermostat; coolant temperature sensor; original power steering pump (had been hoarding a new Bosch ZF OEM power steering pump I found from 2022 that was still manufactured in Germany); all associated bolts, brackets, hose clamps, fastener clips, O-rings, seals, banjo bolts, and transmission line sleeves at the radiator; and performed a coolant flush, replacing the old coolant with the current blue Mercedes formula for this vehicle (the car was due for a coolant flush anyway, since the previous owner had last performed one over 13 years ago when he had his Mercedes repair shop replace the changeover/heater control valve). Except for the radiator and power steering pump, all items were replaced with brand-new Genuine Mercedes parts from a dealership. While the water pump was out, we inspected the O-ring seals surrounding the coolant passages in the front timing cover behind it, and they were still in excellent condition (i.e., no swelling, breaks, and not dislodged), which was a relief. Although this is more of a problem with the seals in the early M112/M113 engines, it sometimes occurs in later engines with age.
Next up: Replace the original in-tank fuel sender assembly (which houses the fuel filter), pump, relay, and associated seals. Although the plastic hat of the original fuel sender assembly isn't leaking yet (a common issue that occurs with age), I'd like to address this preventatively. I purchased the parts months ago from FCP Euro while I could still get deals on the OEM Continental/VDO fuel sender and pump.
Recent service earlier in the year (discussed in this thread) included replacing the original radiator (replaced with OEM Mahle-Behr); original hoses (upper radiator, lower radiator, and auxiliary water pump hoses); coolant lines; expansion tank and cap; all transmission cooler line and hose segments to the radiator (the original transmission cooler lines were severely corroded, as the car has lived in coastal northern New England...); lines to the transmission; water pump; thermostat; coolant temperature sensor; original power steering pump (had been hoarding a new Bosch ZF OEM power steering pump I found from 2022 that was still manufactured in Germany); all associated bolts, brackets, hose clamps, fastener clips, O-rings, seals, banjo bolts, and transmission line sleeves at the radiator; and performed a coolant flush, replacing the old coolant with the current blue Mercedes formula for this vehicle (the car was due for a coolant flush anyway, since the previous owner had last performed one over 13 years ago when he had his Mercedes repair shop replace the changeover/heater control valve). Except for the radiator and power steering pump, all items were replaced with brand-new Genuine Mercedes parts from a dealership. While the water pump was out, we inspected the O-ring seals surrounding the coolant passages in the front timing cover behind it, and they were still in excellent condition (i.e., no swelling, breaks, and not dislodged), which was a relief. Although this is more of a problem with the seals in the early M112/M113 engines, it sometimes occurs in later engines with age.
Next up: Replace the original in-tank fuel sender assembly (which houses the fuel filter), pump, relay, and associated seals. Although the plastic hat of the original fuel sender assembly isn't leaking yet (a common issue that occurs with age), I'd like to address this preventatively. I purchased the parts months ago from FCP Euro while I could still get deals on the OEM Continental/VDO fuel sender and pump.
Last edited by Œuvre; Jul 5, 2025 at 11:40 AM.
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Joined: Jul 2025
Posts: 2
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I recently bought a Black with Tan interior 2009 E350 Sport with 46,700 miles 
Garage kept and driven 1500 miles a year for the last decade
Immediately did a transmission flush and oil change, replaced the 13 year old tires and added ceramic tint. Next up is updating the headunit to something with carplay/android auto and a backup camera, and then lowering it.
Garage kept and driven 1500 miles a year for the last decade
Immediately did a transmission flush and oil change, replaced the 13 year old tires and added ceramic tint. Next up is updating the headunit to something with carplay/android auto and a backup camera, and then lowering it.
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Joined: May 2021
Posts: 2,528
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From: US
2008 E350, 2012 ML350, 2014 E350, 2015 ML350
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Joined: Aug 2025
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2008 E550
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