I just noticed that in the Houston area several places now have signage that indicates the fuel you are buying "may contain up to 5% biodiesel or renewable diesel".

No problems yet and not even sure how long I've been running this stuff. Not sure if I can even get straight "ultra low sulfur" anymore. (never thought I'd be saying that!)

Any one have experience running this in a 7.3?

Here is the thing about Diesel, in the Us the cetain rating on diesel is about 31- 37 you need mre than that. there is an aditive to bost the rating.Also in many as in the 6.4 , 7.0 7.3
ect you need to change the antifreeze regular in a diesel motor it causes air bubbles and cavation happens and it eats away at the in side of the block near the cylinders.

My '01 7.3 still uses the green coolant. I change it every year and include the diesel additive when I change and when I top off.

Just noticed this thread. The biodeisel replaces the lubricating function that got lost when they took the sulfur out. Not a bad thing. Cetane rating is greater as well.

Some are running 100% around here in the summer and would run it year around if they could. Mileage is better, but gel point can be around 40 degF. Which is why tank heaters are used in summer to get the bio to flow.

Most that make their own have two tanks. One regular diesel that they start up with and the 2nd tank is 100% bio that they switch over to once the engine is warmed up and the heaters have gotten the mixture up temp.

Still running it, most of the time. So far, so good!

Most of the BIO part of biodiesel is animal fat. It is an excellent degreaser and will cut varnish from the inside of older diesel fuel systems. If you have an older diesel and have never used biodiesel before it will cut the varnish loose from inside your system and send it through, hopefully your filter system will trap it. If your filter system does not trap it the results are very ugly and expensive. There are more and more retailers on the roads selling biodiesel, some pumps are marked and some are not, since they get a rebate from the feds for selling it, just a word of warning for those who have older diesel vehicles.

I will soon get my first fuel filter change since the 5% stuff came out. I'm going to ask if it looks dirtier than normal.

Since there is now less than 15 PPM of sulfur content in the ULSD, (has to be less than 12 PPM to ship on pipeline) all facilities that transport to the consumer or to retail sales have to inject a Lubricity Additive into the diesel for obvious reason. There are three major players in the market and the additive packages are very good products. There are no concerns about lubricity factors of the ULSD.