I thought I should also warn you that if you have been running diesel in your car for 100,000 or more, your intake manifold is clogged with a thick build up of soot from the petroleum residue. At 100,000 miles your car is due for a regular maintenance of cleaning this crap. However, if you use biodiesel it cleans the manifold of this thick nasty gunk.
Many times people bypass the EGR because of this. Using 100% biodiesel prevents this.
The downside is that if you been running over 100,000 miles with diesel and just started using B100 (100% biodiesel) it will clean the intake manifold and leave a nasty gunk, dissolved as oil in the intercooler. Your car may start choking and become difficult to start. To fix this, just undo the right front tire and find the tubes leading to the intercooler. Disconnect the tube and collect the nasty oil that collects from the cleaning of the intake manifold. Do this at least once a month until you find no more collection of oil.
This cost me $1000 to clean manifold then another $600 to find the collection of oil in the intercooler from the cleaning from the B100.