That black stuff is asphaltene. The newer ULSD is bad about it. My filters (U1300, O366A) were plugging every few hundred miles. A fuel system that recirculates and heats the Diesel in the tank compounds the issue.Time to do fuel filters, I suggest you change yours too.
First and second filter looked about the same but there was zero sediment in the second filter housing, just some black floaties, first filter and housing is pictured.
To put this in perspective, got the mog about 7 years ago (wow time flies) at 6k miles, changed fuel filters and cleaned sediment trap, fast forward to today at 9k miles and this is what I got. Give these trucks some loving. Starting to question fuel quality in Ventura county, my dodge 12v had some pretty bad sediment in the strainer too, but it has 260k and a questionable history, Last two pictures are the strainer screens/bowl on the dodge for reference.
I fled Calgary yesterday for the same reason
Trev, feel free to move;................. Maybe should be moved to one of the old lube threads?
...................................... Anyone have knowledge/ ideas as to what the black actually is? ..........................
The black stuff is iron sulfide - normal.
Thanks for the quick reply and comforting information. Good to think there is no huge impending catastrophe. I will update in 10 +/- years as to performance of Amsoil in Mog diffs(!).
My concerns arise from the 100k mile gear lube changes on my F250. The Amsoil synthetic comes out looking essentially the way it went in.
Will you plan to make a thread about the cab restoration efforts? If so I will be watching closely as both the cab, doors, and fenders on our truck need some attention and hope to get taken care of sooner rather than later.Started prep for paint. Stage 1, repair the only rust on the cab. Damn windshield rust is a pain!! Luckily there was only 1 pinhole that can be welded easily.