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Is it ok to seafoam a late model Mercedes?


Is it ok to seafoam a late model Mercedes?

Old 10-24-2007, 06:21 PM
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Default Is it ok to seafoam a late model Mercedes?

I'm aware that there are many many many sensors on a 500 motor so I'm thinking seafoaming it might piss it off. The engine runs crappy at idle. The rpms wander and it can shake the car a little. The mechanic didnt get any codes and couldnt find anything wrong with it. It has 88k miles and has been maintained. It may be that they dont do plugs and wires until 100k. Should I seafoam it before I take it to a new mechanic?


miike is offline  
Old 10-24-2007, 07:18 PM
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Default RE: Is it ok to seafoam a late model Mercedes?

I can't imagine that seafoam would cause any damage, but the computer might pull timing to compensate for any out-of-spec readings if it changes your octane or substantially alters the chemical composition of the fuel.

Go to mbworld.org and post your issues in the section related to the vehicle that you have. There are many knowledgeable owners there, some of whom may have experienced something similar with the idle.
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Old 10-24-2007, 08:03 PM
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Default Re: Is it ok to seafoam a late model Mercedes?

FWIW, I had the same problem with my '01 Tundra( 4.7 liter V8 lexus engine) @ 85,000 miles. Was a bit rough at idle, and just didnt seem to have the original giddyup. I took it to the dealer and had them change plugs, clean the injectors and intake. I was very surprised how much better it ran when I got it back. Very noticeable. It wasnt cheap, but well worth it. I had tried sea foam in the gas tank for a while with no luck ( no alarms or codes).
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Old 10-24-2007, 09:44 PM
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Default Re: Is it ok to seafoam a late model Mercedes?

It's a German car, just about everything causes a light to illuminate. Definitely check at an MB forum, the 500 engine is quite the beast. That said, I don't see Sea Foam hurting it. Assuming it's not a turbocharged version of that engine, it would probably be OK. If it is turbo/supercharged (I think a few of the later model versions were), I'd hold off. Additives and such scare me when it comes to turbo engines.

That said, at least it's not Swedish. Ahh, memories of my "Saab stories."
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Old 10-25-2007, 09:56 AM
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Default Re: Is it ok to seafoam a late model Mercedes?

My 2001 S500 is also running a little rough at idle but has 145000 very reliable miles on it. At 100000 all the plugs and some not all of the wires got replaced the car ran perfect before and after that service no change also the independent mechanic said it was ludicrous to wait that long the plugs can get stuck bad and they should be changed at 50000. Now after the last service around 135000 is when it started running rough at idle but not at higher rpm's and hasn't seemed to affect mileage. I say don't put anything in the tank except fuel (I've always run plain unleaded) and find a better mechanic. Mine has never failed to correct any problem and the wothless dealer was unable to fix anything right the first time. Cheers!
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Old 10-25-2007, 10:12 AM
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Default Re: Is it ok to seafoam a late model Mercedes?

I put seafoam in my old POS Ford Explorer when it would not idle properly. It fixed it within a few miles, it does not cost much to try it before spending big bucks at the shop.
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Old 10-25-2007, 02:12 PM
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Default Re: Is it ok to seafoam a late model Mercedes?

I painted my old dart wagon seafoam, and I thought it looked great!!

Sorry. I'm feeling a little punchy today...
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