Re: E90 323i Wiper juttering
Congrats on your new ride. I've a similar problem (I drive a 320) whereby the wipers are extremely nosiy and squeaky. Repeated complains have not yielded any permanent solutions from PML. So far, they've changed my wipers twice and filled up my wiper fluid reservoir with some soap solution. I've been advised to lubricate the wipers with the soap solution to minimise the noise. This is not feasible during heavy downpours as we're trying to clear away as much of the rain droplets as possible and activating the spray would only make visibility worse. Moreover, the rain washes away the soap pretty quickly. Anyway, during such heavy rains, I cant hear the noise from the wipers...
You can do a search on this issue, I think it has been discussed previously.