Biodiesel is easier on engines. Field tests indicate that engine life is increased with biodiesel usage. The use of biodiesel and biodiesel blends results in a noticeable change in exhaust odor. The reduction in smell and change of odor are easier on ship workers and pleasure craft boaters. In fact, it's been compared to the smell of French fries.
Users also report no eye irritation.
Since biodiesel is oxygenated, diesel engines have more complete combustion than when using petroleum fuel.