Does the 6637 actually clean?
Post Fiend
Joined: Feb 2002
Posts: 10,600
Likes: 3
From: Carhenge
Originally Posted by bdrummonds
Thanks hosemandc, now that we know that the 6637 was originally produced as a filter for dusty areas (think of the duty cyle and were it works for those air compressors) we know it should filter plenty enough for our trucks.
On edit: Here's a link:
http://www.donaldson.com/en/catalogs/engine/033621.pdf
Last edited by clux; Jan 10, 2007 at 05:06 PM.
Lead Driver
Joined: Oct 2004
Posts: 7,413
Likes: 1
From: Columbia, MO
I've had the same 6637 filter on for the past 12K-15K miles. My silicon levels are as follows, every 3000 miles from 150K: 6 (3000 miles on oil), 10 (6000 miles), 8 (3000 miles) , 10 (6000 miles), 9 (3000 miles).
Post Fiend
Joined: Feb 2002
Posts: 10,600
Likes: 3
From: Carhenge
Both my AIS and my 6.0L filter have yielded UOA silicon levels of 6ppm at 10,000 miles in very dusty operating conditions. The virgin samples I have seen of the same oil type (delo 400) typically come back at 5ppm. So my filters have allowed a net increase of 1ppm in 10,000 miles. That's pretty good filtration IMO.
