I have done a bunch of reading on here about biodiesel usage. So far I haven't found anyone reporting any problems with Biodiesel in their LB7 or LLY Duramax with the exception of a filter change out.

I know what GM says (5% max)

I am interested in info on LB7 or LLY equiped trucks running store bought B99 or B100 only. (These non blended fuels seem to be the cheapest)

I am looking for info on any reported problems after using these fuels. Or how many miles do you have without any problems.

Thanks

The Brake Stop here in Santa Fe, TX will be selling B100 soon. Since the duramax injectors seem to have problems with regular diesel fuel I was wondering how they would react to pure biodiesel?

I have a LBZ and have ran B20 with great results since I got the truck.

A friend of mine has an LB7 and has ran B99-B100 with 0 problems for the last two years. I asked him if he had any problems with it gelling in the winter and he just looked at me like I was crazy. I live in FL but I would have thought on the few nights we have down around freezing he would have problems but nothing. It could be the stock its made from cause I know that makes a huge difference but I was suprised that he never had a prob with gelling.

Thanks Man, Good info!

Southern climate or not, B100 may be a concern with some engine materials, it has 11% less BTU engergy content than petro Diesel, enables microbe growth better than petro (fuel storage issues), and will form engine and piston deposits much more readily. Fuel dilution is much more likely as well. If you do use, make sure to use an oil with a very robust additive package to try to keep things cleaner. Shortening oil drains may help (oil analysis doesn't tell you what deposits stay in the engine). Make sure the B100 supplier is BQ9000 accredited and their B100 meets the ASTM bio spec. Even very small blends of bio do offer great lubricity enhancement.

The challenge here in texas is more on finding a station that sells it. The amount was curb two years ago.

Thanks again for the good info.

I had wondered about a microbe/bacteria problem but I hadn't heard anything about deposit problems before.

Just started running it in my LBZ, Kubota, Sprinter, and my brothers 6.7L Cummins. No problems to date. Headed out to the barn now to start washing 50 gallons.

I have used B100, B80 and B20 with no problems.

If you are just starting with Biodiesel, be sure to keep an eye on your fuel filter. Even B20 will carry fuel system deposits out of the tank & fuel lines, clogging your filter. I recommend carrying a spare filter that is already set up with a WIF sensor. That filter can get clogged FAST when you first start using Bio. This issue disappears after a few tanks of Bio.

My brother in law ran B99 all last summer. He did get algea in his tank to the point they had to drop and clean it. If you are going to run it a long time you should use an algecide once in a while. I ran about 200 gallons of B99 last summer with no problems.

The latest thing now is pure bio is higher than straight diesel.

FWIW ( I have a 1994 6.5) As I understand it GM went to Viton lines in 93-94 so your newer truck shouldn't have any issues. I have been buying B100 at Houston Biodiesel for the last year and half or so with no problems at all. Only complaint to be had is that bio has a lower heat value so I lost about 1.5 mpg. If it is a money thing, keep that in mind. If you are going "green" that is the only downside. Also depending on what lubricity additive you use, and how much you pay for it, that offsets some of the cost. You don't need to add lubricity to biodiesel.

I make my own Bio-D from used vegtable oil. so far so good. I haven't had any problems and it only cost me $1 per gal. It can be a lot of work from time to time but in the end it is fun and it is totally worth it. I love driving now because I know I am running on something I make myself. It is like eating a vegtables from your own garden. There is some work involed but its totally worth it.

I haven't had any problems with bio willies b99 except for lose of power and worse mileage , motor seems to have gotten louder to