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Stock 2003 S55 AMG... Maintenance/ What should I do next?

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Stock 2003 S55 AMG... Maintenance/ What should I do next?

Old 05-13-2019, 11:37 AM
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2003 Mercedes Benz S55 AMG
Stock 2003 S55 AMG... Maintenance/ What should I do next?

Hello everyone, let me start off by saying I am new here. I have just purchased a 2003 Mercedes S55 AMG with 147,000 miles from a private seller. The car is in great condition and has nothing done to it but a resonator delete. I know of the insanely expensive repair costs, but I found one for a great deal and I could not pass up! How should I go about basic maintenance on this beast? Also, I would love to upgrade the ECU, tune the car, upgrade the pulleys, but would this compromise the cars “reliability”? If so, what problems could I expect to run into. Thanks in advance!
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Old 05-13-2019, 02:35 PM
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05 W211 E500, 03 C215 CL55 AMG
Won't hurt reliability as long as good parts are used.

If you go for power mods you'll want to at minimum replace the IC pump with the latest bosch 010 version.

M113 are very stout engines. Just make sure your fluids are all good.
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Old 05-13-2019, 08:24 PM
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2003 S55 (SOLD) , 2012 S550
I had an 03 S55 for 7 Years and most of my money went into the ABC system. (3 pumps and one hose after another which also made 2 of the 3 pumps fail)
I would rip out every rubber high pressure hose in the system and replace them and all accumulators. While in there i would rebuild the valve blocks and then flush the whole system. After that you wont have to worry about that system for awhile BUT i would flush it every 2 years.
Other then that i did not have to many things go wrong. And i ran it for 170K for a total of 250K when i sold it. As far as i know it is still on the road. No major engine or tranny work other then fluids. I flushed my tranny every 35-40k.

Good luck with it.
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Old 05-14-2019, 01:02 PM
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'03 S55 (79K miles)

All fluids and filters: engine oil/filter. Tranny oil/filter. Engine air. Cabin air. Fuel. You are fortunate ‘03 has a transmission dipstick tube and oil dipstick tube. (You need to buy your own tranny dip stick)

The electrical connector ($12) that goes into the tranny sometimes leaks. Replace it when you drop the pan for the tranny fluid/filter change.

ABC including flushing out old while pouring in new Pentosin CHF 11S until nice clear green comes out the reservoir return pipe. Bleed at each wheel arch. Also doesn’t hurt to replace all the ABC accumulators (I think there are 3 or 4). Replace ABC hoses that are leaking. Remove ABC Valve bodies (1 in front of left front wheel well + 1 above/behind left rear wheel well) and check the 4 solenoids in each for worn o-rings that could cause leaks. Most people dump these cars when ABC breaks.

Antifreeze for engine and supercharger intercooler.

Change supercharger oil (Mobil Jet Oil 2).

Change front pulleys. Plastic OE ones wear out and bearings get squeaky before they blow.

Next common issue is leaky vacuum lines that control the soft-close door lock and trunk lock mechanisms. Trace leaks and jbweld them,or replace components. Pump is in trunk on left side behind carpet wall.

Rear diff gear oil replace.

Brake fluid flush out old stuff at each wheel every 2 years.

Usual things like trunk lid struts, wipers, battery (in trunk).

Replace the alarm horn behind left front wheel well liner, if you find the beep is not working. It has a small battery inside that also dies after too many depletion cycles in storage. When it dies, it sets alarm system failures.

Last edited by GrepAwk; 05-14-2019 at 01:08 PM. Reason: Typo
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