Instead of writing several new articles, I am just going to extend this one article to have several pages. Look at the table of contents for your specific interest, or read the whole article. I will discuss some of the kits that were on the market during the years of my installations, some of the information I picked up along the way, and a description of my installation (standard) on a Mercedes 300SD.

I wanted to convert a car in early 2004, but I had to buy the vehicle... A 1984 Mercedes 300SD. After fixing a few problems, I was ready to convert over the summer but lacked the funds. I finally bought the Greasecar kit in October of 2004.


1984 Mercedes 300SDThe vehicle has 265,000 miles on it. The exterior has a newer paint job, and the interior is fairly nice. All electronics, including AC, work. In fact, after I fixed the alternator and the gas leak, I started to question the sanity of converting this car to run on veggie oil-- it's so nice to drive. I'd read in a number of forums that these old ('85 and older) Mercedes diesels are the most tolerant to goofs like me messing around with oil.





interior 300SD This car is twenty years old and has 265,000 miles? The front seats look good, though the springs aren't exactly bouncing back like they once did. Notice the black (in good shape) dash and cream interior-- the original car was more of a cream, and since painted green, which seems more appropriate for my application.








300SD trunkHere you see the spare tire, where I will eventually mount the second tank. When I bought the car, the tires looked like they had little cracks in them. I was on the highway one day and a big chunk of rubber came off one of the tires, and then I replaced them all. I've since seen a news report that said old tires can create major problems, so remember to check those tires on cars you don't drive much.


Here's a video of my next vehicle, a 1983 Mercedes 300SD. {youtube}yDi4N_zj-X0{/youtube}








Intro: How many of you would like to use free fuel for your car? What if you could help reduce pollution while using that free fuel? Sounds pretty good; I have done just that…


  1. History
  1. Rudolf Diesel late 1890s; engine is 40% more efficient
  2. Veggie as self-sustainable fuel (photo)
  3. Rudolf disappears (military)
  4. Petroleum companies use bi-product


  1. Researching conversion/Authority
  1. Saw article in Car and Driver
  2. Looked it up on the internet
  1. Fuel is free (waste)
  2. Conversion costs money
  3. Diesels cost more but last for a long time
  1. Kit or own design
  1. Must have heated fuel line and separate fuel tank
  2. Heat is very important and not enough will cause engine failure
  3. Some stereo installation experience, but not much with engines


  1. Buying Vehicle
  1. Must be diesel
  2. Late-model Benzes are best, but all work
  3. Monetary concerns
  4. Mine is 84 300SD; 260,000 miles (photo)

1. High-mileage cars often have issues (alt. / batt. / coolant / tires / glow plugs / IP) photo


  1. Buying Kit
  1. Greasecar highest quality/ best in winter
  2. Wanted it installed, but $800 for Greasel $700 for Greasecar
  3. Can pay for itself within a year if I install
  4. Kit and parts
  1. Fuel gauge and switches photo
  2. Coolant heated fuel filter photo
  1. Vegetable oil needs to be over 150 degrees
  2. Coolant is always circulating at high temps through engine
  1. Clamps and T’s photo
  2. 6-port valve photo
  1. Switches between fuel sources
  1. 3-port valve photo
  1. Switches between fuel tanks (for return)
  1. Aluminum fuel tank (15 gallon); coolant and fuel hoses photo


  1. Installing Kit
  1. Switches and gauge in box
  1. Switches for choosing fuel source/ return tank
  2. Gauge to know amount left
  1. Power source
  1. Splice power from stereo
  2. Run to box in center console
  1. Install tank in spare tire area photo
  1. Hole saw to drill two holes for hose to pass through
  2. Fuel line is run through inside of coolant line
  3. Wire from fuel gauge hooked up
  1. Coolant lines run from trunk to engine photo
  1. Car jacked up and zip ties used
  2. Bring lines past steering column
  3. Fuel line pulled out of coolant hose and run to filter
  1. Coolant lines spliced using T’s chalkboard / point of no return
  1. Cut coolant lines and run to filter
  2. From filter, run coolant back to tank photo
  3. From tank back up to upper radiator hose
  1. Fuel tank secured and insulated
  2. Fuel hoses installed photos
  1. 6 port valve from 2 fuel sources (lift pump) to separate filters
  2. 3 port valve from return fuel line back to tanks
  3. Hollow bolt replaced with solid bolt (to avoid mixing of fuels during return)
  1. Insulation of hoses
  1. Coolant lines on outside of car
  2. Fuel lines inside engine compartment
  1. Troubleshooting
  1. Coolant hose rubbing against throttle zip-tied
  2. Leaky fuel tank silicone sealed
  3. 3 port return valve hooked up backwards = switch opposite of instructions
  1. Operation
  1. Start car on diesel
  2. Warm up to 80 degrees C
  3. Switch both valves
  4. Run on veggie and let everyone behind you get hungry
  5. Switch 6 port valve back to diesel
  1. Run on diesel 30 seconds
  2. Fuel is returning to oil tank (can’t have oil in diesel tank)
  3. Can’t shut down on oil because it will gel
  1. Switch 3 port valve to return to diesel and ready for next start
  1. Maintenance
  1. One extra fuel filter to replace
  2. Must pre-filter vegetable oil (hardest part)
  3. Fuel injector cleaner
  4. Air in fuel lines is death for a diesel
  1. Conclusion
  1. Saves money on fuel
  2. Reduces pollution and reuses waste
  3. Conversation starter
  4. Car is barely altered (photo)
  5. Government not yet concerned with us
  6. Everyone needs a hobby