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[girlmark]

I don't have a 6.0, but now that most of them are out of warranty, a lot more people are running them on biodesel, so I'm interested in the subject.

It REALLY seems to me that people have trouble with these on 100% biodiesel. They seem to develop this weird goo after some number of miles (sometimes 20,000 miles, sometimes less, it seems to be unpredictable how long it takes) that comes out of no where and seems to just keep on coming.

What seems to happen is that something disintegrates in the fuel system, and destroys (extremely expensive) injectors. It doesn't seem to be related to fuel quality as far as I can tell. It seems to be related to using a biodiesel/diesel blend over 75%.

Also, the goo is not caused by petroleum residue in the tank being cleaned out by biodiesel, as it happens to very new vehicles with no history of residue (and this doens't happen to any other vehicle that I know of).

Usually 6.0 drivers seem to have no problems at B50 (50% biodiesel, 50% diesel). I think I've heard pretty consistently that B70 or so is fine as well.


I have heard a rumor that it was finally tracked to the stock filter, and that the element dissolves in 100% biodiesel. I'd like to know if there is an aftermarket replacement for the stock filter or if anyone knows for sure that the original filter is the cause of this problem (anyone want to send me an old stock 6.0 filter that I can soak-test in biodiesel- I don't feel like going out to buy one just for this test).

There was a lot of misinformation about what caused this when the 6.0's first came out and people started seeing this problem for the first time.

At first people thought the goo problem was due to the fuel being destroyed by the high pressure fuel system, so this led to a persistent rumor that all common rail injection systems would have problems on biodiesel. This has been completely disproven.

You might still run into someone on the net saying that it's fuel 'polymerization' due to high pressure. However, no other vehicles with a high-pressure fuel system seems to experience this issue.

I have heard a couple of times now that it's the fuel filter in the 6.0, and I'm trying to track down whether anyone knows for sure that this is the case.

I haven't been able to find positive confirmation that changing from the stock filter to an aftermarket filter gets rid of the problem permanently. The clogging goo problem may recur 20,000 miles later (I've heard from couple of users that this happened to) or may recur sooner, so it's hard to tell whether a change has helped or not unless you follow a user's experience for a long time.


Also, I don't think the same set of problems happen on SVO or solvent blending with these trucks.