steel vs. alum. control arms...............

[Hector]

http://www.bimmer.info/forum/showthr...m+control+arms

[Bill R.]

never seen one break thats steel. On the 7 series board someone had an aluminum one snap while his wife was driving. I'm sure it didn't just snap on its own, that something had to have been hit but never the less it broke and i've never seen a steel one do so.. The weight difference is less than 4 tenths of a kilo if you look them both up in the etk. This is unsprung weight but it doesn't have the same effect that lightening up wheels would do for handling. The control arm weight would have much less effect overal. I'd go for steel, can't see aluminum worth the additional cost to me.

we lifted the car to confirm that the thrust arm bushing arm cracked already & they are not even 1 year or 10k miles old.
so i am going to start pricing all the parts i would like to replace.
what are the pro's & con's of alum. control arms?
thanks
tim s.