well for me the environmental angle is a bonus not a primary reason. I went diesel for several reasons namely Lower cost per mile (better economy) and much longer lasting engines. A secondary benefit is that I might be able to play around with biodiesel.

My carbon footprint in the bigger picture is not relevant. Also bio fuels are a non starter they simply can not replace petro. there is not enough arable land on earth to make enough to meet our needs.

What interests me in alternative fuel is the COST savings. once you invest in the rig you can make bioD for around 55cents a gallon. THAT is my interest.

burning oil in my engine is no worse (and in fact probably better) that what there going to do with it. (around here people use it in heaters for there homes and businesses and what they can not use they pay to have taken away)

If I can get it for free and process it myself that is better than 55 cents a gallon AND no $4000 rig to purchase to do the processing :-) magnets are $80 a pop and maybe $200 for the centrifuge parts probably less if I scavenge for them. An old electric kiddy car motor might work and I have a few of those lying around.

My primary concern is safety #1 for me #2 for my car. Small risk is acceptable. I am planning on swapping motors and trannies anyway if I can not cheaply repair the ones I am using. I figure I have a few years or 100-150 thousand miles before these start giving me problems. I would rather experiment on these units than my better drivetrain in the 75 :-)

if it works I save 2 grand a year when your making 14k a year 2 grand is HUGE :-) will give me incentive to switch my van over to diesel. Then I would save closer to $3k in fuel!! the savings alone would pay for the new engine in 1.2 years. I want to put a 4cyl Cummin TurboD in my van.

WVO is also a dead end I believe in the long run. Eventually all the sources will either be locked up (by another WVO user) or regulated out of usability (they want there taxes after all) OR the restaurants will get smart and start charging for it :-)

If I ever have enough to buy the processing rig to enable mass production of BioDiesel I will definitely give that a go just because it would be fun.

So that still leaves two questions. Will fuel and oil mix or separate and how MUCH oil can I burn ? I assume I can not go straight motor oil - whats the highest percentage I can dump in the tank with diesel ? can I go 75% motor oil and 25% diesel ?

It might not be a great idea - but its cheap financially and it sounds like a lot of fun to experiment with. IE its a project for me to do. and in the end it is better for the environment (recycling it this way) verse what there going to do with it but clearly not as good as veggie oil though I DO wonder what the emissions are from a veg car. might be interesting to put one through emissions inspection while running on bioD or veg oil just to see what the gas results are :-) though it is a lot of work I just might make 10 gallons of the stuff JUST to see what it reads when I dyno it. I bet I can get a local garage to do it for me just as an experiment. Then do it again on pure diesel and see what the differences are.

Another experiment now that sounds like fun :-)