The interior of my recently acquired 85 380SE is incredibly squeaky and is driving me nuts! I have owned several W126s and none of them squeaked like this one. It squeaks even when I'm not hitting any road bumps. In all fairness, this vehicle was kept outside in the hot TX sun, so I suspect some warpage/shrinking of plastic has occurred.

Suspension is in top condition, and all motor mounts and shocks, trans, differential, and subframe mounts are new so I don't think the suspension is contributing. I really think the culprits are the interior plastic, vinyl, and leather.

The worst offenders appear to be squeaks from all 4 door panels, along with what I suspect are "leather squeaks" from the seats.

Does anyone out there have any success stories of actually fixing these annoying noises?

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08 W251 R350
97 W210 E320
91 W124 300E
86 W126 560SEL
85 W126 380SE Silver
85 W126 380SE Cranberry
79 W123 250
78 W123 280E
75 W114 280

Sympathy I'm having fun with a squeeky dash in my W124.

My W124 in comparison is 95% rattle and squeak free. Only the visors tend to squeak, and it is quickly remedied (albeit temporarily) by lowering and raising them. But this W126 is just crazy squeaky!

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08 W251 R350
97 W210 E320
91 W124 300E
86 W126 560SEL
85 W126 380SE Silver
85 W126 380SE Cranberry
79 W123 250
78 W123 280E
75 W114 280

Try spraying the lower edges of the doors with silicone spray. A lot of the 126s squeeking comes from the doors.
If your visor has the pull out feature ( where the visor can be pulled to cover farther back when in the side position), pulling it out or in a fraction of an inch may rid the noise permanently.

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82 300D....went to MB heaven
90 350 SDL....excercising con rods

Are you saying to spray the interior door panels, or the actual doors themselves (exterior)? When you say silicone spray, is that something I can just get at Autozone? Or are you referring to silicone-based protectant such as Armor All?

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08 W251 R350
97 W210 E320
91 W124 300E
86 W126 560SEL
85 W126 380SE Silver
85 W126 380SE Cranberry
79 W123 250
78 W123 280E
75 W114 280

same problem with my W126 coming from passenger side dash area....

There is a silicone spray sold at many stores. I get mine from home depot(it's also good for all rubber trim). Spray the interior bottom of the door wherever the door will touch another part of the car (bottom edge).

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82 300D....went to MB heaven
90 350 SDL....excercising con rods

mine was the same, silicone spray, light coat of vaseline or similar on door frame rubber will make an immediate improvement, particullary the gasket that contacts the kick plate on the door frame
Armor all does not last or work as well

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Ron
2015 Porsche Cayman - Elizabeth
2011 Porsche Cayman - Bond,James Bond
Sadly MERCEDESLESS - ALways LOOKING !
99 E320 THE Queen Mary - SOLD
62 220b - Dolly - Finally my Finny! Sadly SOLD
72 450SL, Pearl-SOLD
16 F350 6.7 Diesel -THOR
19 BMW X5 - Heaven on Wheels
14 38HP John Deere 3038E Tractor -Mean Green
84 300SD, Benjamin -SOLD
71 220 - W115-Libby ( my first love) -SOLD
73 280 - W114 "Organspende" Rest in Peace
81 380 SL - Rest in Peace

I would have sworn mine was from the dash area too but it was from the front right door.

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82 300D....went to MB heaven
90 350 SDL....excercising con rods

Yeah it drives me nuts on the SD.

I am spoiled by the SDL, cloth interior means no squeaks!

303 the interor to death that will quite it down.

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1999 SL500
1969 280SE
2023 Ram 1500
2007 Tiara 3200

It seems any fix is temporary. The leather squeaks like crazy even with weekly coats of conditioner. Also the door panel lower edge where it rubs the door sill: I put strips of waterproof surgical tape there, which helped a lot. The noise is much worse when its cold out.

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1985 380SE Blue/Blue - 230,000 miles
2012 Subaru Forester 5-speed
2005 Toyota Sienna
2004 Chrysler Sebring convertible
1999 Toyota Tacoma

Quite a few posts point to the wood trim strips rubbing on the vinyl door panel where they fasten. One guy even removed them and used some kind of tape on the back of the wood then re-attached. I tried the same technique with grease, but it didn't last long.

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1986 560SL
2002 Toyota Camry
1993 Lexus

The leather seats in the back of the SD are louder than the stereo.

Unbelievable squeaks come out of them. I sometimes think there is a convention of mice back there. Treating the seats quiets them down somewhat, but, the leather is quite stiff on the SD and it's almost impossible to eliminate it.

The SDL, on the other hand, which I took out today for the first time in three months, is almost silent.

I do agree with adding silicone to the line where the bottom of the doors meet the plastic on the door sill. It definitely helps that situation.

I also agree that the wood trim strips on the doors will definitely squeak. I have not found a long term solution, either. However, I'm considering getting some very thin rubber (.032") and adding a piece between the wood and the door.

My 1991 420sel squeeks in this way too. Is there a brand of silicone spray that is better than others and how often might one typically have to treat it?

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Der Panzermann und Fraulein Fahrvergnuegen

1991 420SEL 201K "The Big Blue One"
1985 300DT 205K chassis/285K engine nee California emissions "Goldbug"
1983 300TDT 255K "The Womble"
1983 300 DT 214K "Sea Sprite"-Rear-ended a truck
1983 300SD 285K "The Donor" Gave his life so that others can live
1980 500SL Euro 105K "Der Panzer"

my 86 420SEL doesn't squeak as much as it "rustles" like the seats are moving around and rubbing against something else, makes me nuts. It's at the dealer now, trying to diagnose a stumbling/stalling condition that I just can't eradicate, so noisy seats are the least of my worries.

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2002 Ford ZX2
2 x 2013 Honda Civics