Installed new RainX wiper blades on the 300D, even in pouring rain they "chatter" and tend to hop or skip across the glass. It's driving me crazy. The windshield has a few chips but nothing serious. what gives?

They may just not work well with the contours of your windshield. Maybe try a set of cheap Ancos and see if it changes. Did you just change the blades?

Wipers that don't work well are a PITA and you only notice it when you need them...

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My occupational hazard bein'
my occupation's just not around...
1980 300SD
1980 300SD

I had that problem. Switched to a set of bosch made mono arms.... problem solved

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1981 300TD 4 speed manual
Euro bumpers, zender valance and skirts, H&R springs, billy HD's, leveled sls, real AMG Pentas 16x8 et11, vdo boost/egt gauges intergrated into ash tray, eurolights, led 3rd brake light

Do they chatter going both directions or just one way? If just one way, then your wiper arm(s) is(are) bent slightly and not allowing the rubber to "flip" to the other direction.

Fall into the Same Category
(You'll Rue the day you didn't Buy Mercedes/O.E.)
as Diesel Motor/Transmission Mounts.

Get the Bosch "INSERTS" from an Mercedes source.

Although,A year ago, a M.B. Parts manager (Who's got a 400E) told me the
Current "New" batch of Bosch Wipers are CRAP compared to the Product
from 8 years ago.

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'84 300SD sold
124.128

I've found that even Bosch blades that supposedly "fit" are no good. I will ONLY get the OEM Bosch blade....works perfectly every time.

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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 157k miles
06 E320 CDI "Rutherford", Black on Tan, 175k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 144k mi, wastegate conversion, ALDA delete

19 Honda CR-V EX 70k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife

My friend who works at advance tells me not to buy those. He said they suck and are returned on a regular basis.

thanks for the update, I''ll return them and buy the Bosch OEMs. You'd think with the "Rain X" name they would be good, but I guess not.

A clean, wax-free, windshield helps, too. Maybe not so much for chatter, but to fight streaks from the blades. Different car wash products make the glass harder to get really clean. Some of the rubber blades are also impregnated with silicone and/or graphite that may cling to the glass.

Does water flow in semi-circles on the glass along the path of the wiper? I've used a Glass Scrub and similar products to really clean the windshield when the wipers start acting up.

The single beam blades don't work well on the contours of the MB windshields. I've gone back to normal bosch ones on all my cars.

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-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)