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Old 01-31-2013, 05:54 PM   #12
tech4tech
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Join Date: Jun 2010
Location: california
Posts: 120
My Ride: e46, 325i
I used the silicon one for mine, but both are likely OK. Silicon is the same material used on the original DISA. Viton is slightly harder (apply some oil/lube before installation) and is worse in terms of it's resistance to cold (-15F low limit), but has better high temp resistance. Silicon has good static sealing properties, and is reasonably good in terms of its temperature range for both heat and cold.
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