AC Delco Filters - Silicon or Nitrile ADBV?

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Does AC Delco use silicon or nitrile ADBV's?

I tried looking online but could not find anything and calling their Tech Line was pointless.

I have a few PF48's (non Ecore) and some UPF48's left over that I can use. If not I'll go with a filter that has a silicon ADBV (Fram Ultra or Wix).
 
They use Nitrile and they get pretty stiff after awhile. The filter media and end caps are excellent though.
I've never seen an ACDelco filter with wavy pleats -- they all come out straight. (non-ecore)
 
Originally Posted By: Mossyoakglock
Do they use nitrile on the UPF models or are those silicon and the regular filters are nitrile?


I think the UPF models do have a silcone ADBV.
 
Thanks. I order some UPF48R's a while back since they don't make the non E-Cores anymore but forgot about them when we moved.

I wasn't sure if they had a better ADBV since they are supposed to be a better filter. Mine is black though. Were they all blue at one point?
 
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