Ask Our Experts

Answers to your questions about gardening, energy, homesteading and other sustainable living topics.

Add to My MSN

Types of Biodiesel

4/16/2012 4:39:12 PM

Tags: biodiesel, biodiesel blends, Todd Kaho

Audi A3 TDI Clean DieselWhat’s the difference between the different types of biodiesel? How can I tell which blend my car can take? 

When Rudolf Diesel invented the original diesel engine in the 1890s, he designed it to run on a wide range of fuels — including vegetable oils. But in the early 1900s, diesel engines were adapted to burn mainly petrodiesel, a cheaper fuel. During the energy crisis of the 1970s, researchers began to reconsider vegetable oil fuels and found a simple method for turning vegetable oil into a usable diesel fuel.

These days, with “clean diesel” cars using sophisticated fuel injection and exhaust system pollution controls, it’s important to be more careful about the use of biodiesel because using it may void the vehicle’s factory warranty. But that doesn’t mean that biodiesel blends can’t be used safely.

Types of Biodiesel

Pure biodiesel is called B100. More commercially available biodiesel blends are B20 (20 percent biodiesel and 80 percent petroleum diesel) and B5 (5 percent biodiesel, 95 percent petroleum diesel).

All of the diesel cars currently offered in the United States come from German automakers. Fuel prices are considerably higher in Europe than they are in North America, so diesel cars are much more popular there because diesel cars are more fuel efficient than gas cars. In fact, more than half the cars sold in Europe now have diesel engines. Several Japanese automakers have diesel models in the works, but they are proceeding cautiously. Chevrolet has promised a diesel version of its high-mpg Cruze for 2013.

Diesel cars and SUVs from Volkswagen, Audi, BMW and Mercedes-Benz are all now approved to use B5 under warranty. Volkswagen was the first to allow B5 and the automaker currently is testing B20 blends. Always check the owner’s manual before using biodiesel to make sure doing so won’t void your warranty.

B20 is approved for use in heavy-duty diesel trucks. The most recent models with the Ford Power Stroke, GM Duramax and Dodge Cummins diesel engines all can run B20 biodiesel without warranty worries. 2011 Ford Super Duty pickups even have “B20” boldly displayed on the Power Stroke fender badge.

Even in relatively small blend percentages, the addition of biodiesel as an alternative fuel is a step in the right direction, reducing our dependence on foreign petroleum with a sustainable, domestic alternative.

— Todd Kaho, Editor and Publisher, Frugal Driver 

Photo courtesy Audi 



Related Content

Make Your Own Green Cleaners

Make your own all-purpose cleaners, dishwasher detergent and mildew remover with safe, simple ingred...

Absorb and Clean Wins Retailers’ Choice Award

Absorb and Clean delivers unmatched performance for cleaning up liquid spills on land, water, and ha...

Proud Mary Keep on Burnin'—Biodiesel, That Is

A couple readers passed on their advice about how to handle car dilemmas. Maybe biodiesel is the ans...

MAX Update No. 28: MPG Heats Up

Thoughts on the potentially fuzzy math of mpg calculations.

Content Tools




Post a comment below.

 

Jan Steinman
6/22/2012 8:16:34 PM
This article makes biodiesel sound scary! The reality is that any vehicle manufactured since 1996 is B100-ready. That's when Europe mandated biodiesel compatibility, and rather than split every diesel into two product lines, other auto manufacturers went along. Diesel vehicles older than 1996 can also use B100, but rubber fuel components will be subject to slow deterioration, requiring eventual replacement. This is most often the main fuel lines, which will give good warning by getting "spongy" and "weepy" well before outright failure. In my experience, the return lines from the injectors go first.







Subscribe Today - Pay Now & Save 66% Off the Cover Price

First Name: *
Last Name: *
Address: *
City: *
State/Province: *
Zip/Postal Code:*
Country:
Email:*
(* indicates a required item)
Canadian subs: 1 year, (includes postage & GST). Foreign subs: 1 year, . U.S. funds.
Canadian Subscribers - Click Here
Non US and Canadian Subscribers - Click Here

Lighten the Strain on the Earth and Your Budget

MOTHER EARTH NEWS is the guide to living — as one reader stated — “with little money and abundant happiness.” Every issue is an invaluable guide to leading a more sustainable life, covering ideas from fighting rising energy costs and protecting the environment to avoiding unnecessary spending on processed food. You’ll find tips for slashing heating bills; growing fresh, natural produce at home; and more. MOTHER EARTH NEWS helps you cut costs without sacrificing modern luxuries.

At MOTHER EARTH NEWS, we are dedicated to conserving our planet’s natural resources while helping you conserve your financial resources. That’s why we want you to save money and trees by subscribing through our earth-friendly automatic renewal savings plan. By paying with a credit card, you save an additional $5 and get 6 issues of MOTHER EARTH NEWS for only $12.00 (USA only).

You may also use the Bill Me option and pay $17.00 for 6 issues.