Originally Posted by dscluchfc
Bill, I bought the truck at 2 yrs old with 41,700 miles on it.
Obviously, I have already made the decision to not trade, but do the repairs and drive it some more.
Scoggin-Dickey in Lubbock is one of the largest parts distributors for GM in the nation. They are the source of the info on the OEM filter only being 7 microns. I will have to double check exactly what specs are on that filter at the dealer. I know the CAT filter is 2 microns and cost $17.75 each out the door instead of $55.10 for the OEM filter, so I am not unhappy about the secondary system from Nicktane.com.
I finally got an answer to the filter medium size. A bunch of folks retired and they had to go back through some engineering work orders to find what I needed. About 6 years ago ALL oem (dealer procured) as well as AC DELCO DuraMax diesel fuel filters went from 10 microns to 4 microns. All parts stock inventory was purged at that time.
The dealer info you got (7 microns) is INCORRECT.
If you are buying aftermarket....check size. 4 microns MAX is recommended. Carry a spare.