I take a more preventative approach and have a screen of fine wire mesh covering my radiator. Think old fashioned back porch screen door material.

It doesn't keep out the finer dust particles, I'm sure, but keeps the bugs and larger road detritus out.

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1974 240D "Boldie" 170K.- New timing chain/freshly rebuilt IP/replaced valve seals/injectors/upgraded stereo/new Bilsteins with Yokohamas/fresh paint and rocker panels plus lots of welds.

Do you know what percentage of blockage the mesh creates? I looked at some mesh material one time for this same purpose (on a different car) and found the mesh had only about 68% of open area. I'm not sure that reducing airflow by 32% is a good idea. Although if yours is of a more open design, it probably works fine.

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'98 E300 turbodiesel

I've been doing this for years. well when I got the car from my grandmother she had some screen on there. I've just kept up with it.
I can't tell you about the air flow through the screen, but I can tell you that since I went to an electric fan, the fan only comes on in traffic in the summer time. so I don't think the screen it hurting anything. And it really helps keep the radiator clean. My grandmother lives near the rice fields of the central valley, and my dad lives on a lake netorious for its nats. The bugs can be thick in both places, the screen catches the bugs no problem.

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