I guess I should weigh in here, having run mostly B50 for almost a year and 16,000 miles. There should be no doubt on anyone's mind: run more than the official 5%, and you (along with your fuel supplier) are responsible for your own warranty on fuel system related issues. If your injectors wear out, your pump seizes, your lines and seals crack, burst, etc., DC won't pay for it.

To that extent, those of us who choose to run higher concentrations are doing part of the Big Boys experimental work for them. I'd like to see them appreciate it more than they have, because I'd be delighted to share everything I learn about it with them, but so far they've played the warranty card as though we were in cutthroat competition for something.

I have had non-fuel system (but by a stretch of logic, possibly related, maybe, tangentially) warranty service denied, and had to pay for it myself. In doing so, I've made some useful discoveries I'm not sure DC's engineers know or understand, but I ain't tellin' them while we duke it out over the warranty work.

On a purely statistical basis, 5% bio blend is a big help with the national petroleum problem. 10% would be even better, as would 20%, but at this stage in the technology, even 5% is not doable: we don't have the capacity to make that much yet.

I am willing to be a guinea pig to a certain extent. I will replace my own injectors if it comes to that. But I deeply resent and will fight attempts to blame every problem the vehicle has on biodiesel use. And stretching that issue to claim that bio use was the cause for EGR valve failure in a vehicle that has had a LOT of them fail regardless of fuel is among those issues.

Apart from the failure of both my EGR valves and the dealer's inability to get that fixed, I've also had a fuel filter clog up, a problem which baffled them completely. However, otherwise, the CRD has run fine, and delivered 28 mpg on a couple road trips using B50. And 27 mpg using the AC the whole way.

If you don't have a good, reliable, high volume source it may be a moot point. Here in the midwest we have Co-Ops that produce bio fuels and regular fuels. I get my diesel from a Co-Op that only has 2% biodiesel, but the other 98% is only american sourced oil. So, I can feel good about that.

My understanding is that even as low as 2% is good for the engine. Right now I'm having a brain freeze, so I can't remember the list of good things other than maybe good lubricity for the injection system and a cleaner burn resulting in lower emissions for the environment.

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'05 CRD Sport born on 06/20/05, bought on 9/23/05, L.O.S.T. on 9/27/05 - modding ever since:

Daystar 2.0" Lift, P255/70R16 Revos, Boulder Bars, Reese Front Hitch w/9k Hooks, Poison Spyder Rock Ring, MOPAR Skids/Bug Shield/Roof Rails/Mats, WARN Hitch Shackle(Rear), 10k Hitch Hook(Front), Custom Tilt/Slope Meter, Ammo Box Mod, Rotella T 5W-40.

I run on 100% biodiesel because I think the following positives outweigh the following negatives:

Positives:

1. I am minimizing my contribution to our oil dependence & its influence on our government's foreign policy.
2. I am minimizing my contribution to global warming.
3. I am exposing myself & those around me to significantly fewer harmful emissions.
4. I am exposing my environment to significantly fewer harmful emissions.
5. I am paying less than I would for petro diesel.
6. I am contributing to my local economy.
7. I am increasing my independence (I can produce my own fuel & commercial biodiesel production isn't oligopolistic)
8. I am increasing the longevity of my fuel system.

Negatives:

1. The use of biodiesel in cold temperatures is difficult (I have chosen to install an engine/fuel system pre-heater).
2. Biodiesel quality is much less assured as compared to petro diesel, and therefore I must take greater responsibility for that quality in order to mitigate the risk of engine damage & expense.
3. Currently, dealerships will jump at the chance to employ the mere use of biodiesel as reason enough to invalidate my warranty, thereby further increasing my risk of expense (& headache).

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2006 Jeep Liberty Limited CRD w/275000 miles