Wix oil filters..
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Shovelman
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T6 is a fantastic oil for emission controlled diesels. I personally use the cummins approved valvoline and napa gold filter in my 03 dodge. Yearly oil change in may since i only drive when I'm hauling less than 10k miles a year, recommended service is 15k.
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RT Hauling
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After doing some research on filter flow ratings (looking at some race filters) I found that Wix and Purolater were purchased by Mann Hummel filter. I have been using Purolator filters with no problems, but there seem to have been complaints since the changeover. A former employee wrote on a forum that the new company cut back on sharpening a blade that puts in the pleats which ended up causing the filter media to tear. So as mentioned, it is best to pick your favorite but change it often.
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Keepaeyeonit
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Sorry if I'm getting somewhat off topic but I like talking about this kinda stuff 
I've always ran Napa gold filters in all my previous trucks ( we also ran the fleet on them also when I worked for the cement co) and never had a single problem. I stopped using Fram filters when I sold my 1988 Ranger for my 1992 Dodge diesel,
I always ran Rotella oil with very good results ( but in old school diesels) I ran Delo 400 15-40 in my 7.3 and now run Delo 400 LE 5-40 full syn CJ-4 in my new truck with Motercraft filters ( just because I got a great deal on them when they closed the local Advance Auto, 1/2 price and I cleaned them out
) I buy the OEM filters from the dealer for my wife's Toyota as they are the cheapest out of any filter I can find.
Just a FYI but I'm sure most people already know that have a Ford 6.7L with the new CK-4 oil designation, it must be the old CJ-4 or on the list of approved oils if it's CK-4. The phosphorus levels need to be over 1000 for the Ford diesel.
I've always ran Napa gold filters in all my previous trucks ( we also ran the fleet on them also when I worked for the cement co) and never had a single problem. I stopped using Fram filters when I sold my 1988 Ranger for my 1992 Dodge diesel,
I always ran Rotella oil with very good results ( but in old school diesels) I ran Delo 400 15-40 in my 7.3 and now run Delo 400 LE 5-40 full syn CJ-4 in my new truck with Motercraft filters ( just because I got a great deal on them when they closed the local Advance Auto, 1/2 price and I cleaned them out
) I buy the OEM filters from the dealer for my wife's Toyota as they are the cheapest out of any filter I can find. Just a FYI but I'm sure most people already know that have a Ford 6.7L with the new CK-4 oil designation, it must be the old CJ-4 or on the list of approved oils if it's CK-4. The phosphorus levels need to be over 1000 for the Ford diesel.