Just add some silicone oil to it. If you want, I have a heavy duty clutch that I used to run in the summer before upgrading to the electric fan. I think I put in 2500 cst silicone. When it engages you definitely hear it. Think of being next to an 18 wheeler when it takes off from a stop. The good thing is that once it engages, you're engine is cooled to temp within a minute or 2.

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1990 190E 3.0L