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My w126 has a mono wiper.
I didn't own it long before I figured out that the left blade wears out before the other one. I removed the wiper arm on the right side and the LS cleans the windshield just fine, good enough for me.
That blade will last two times longer because it isn't wiping a dry area constantly. I still buy blade two at a time.
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84 300SD
85 380SE
83 528e
95 318ic
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