Additional Diesel Fuel Filter for Cars: A Solution for Biodiesel? Experts Weigh In

SOLO, KOMPAS.com - Adding a diesel fuel filter to diesel cars can help improve safety when using biodiesel, but it is not the main solution that completely eliminates side effects. The additional filter only serves as extra protection in the fuel system. Its role is to act as a place for water content in biodiesel to settle. “That modification does not change the biodiesel content, so modern diesel cars should still use fuel according to the manufacturer’s recommendations,” said Jayan to KOMPAS.com on Friday (24/4/2026). Biodiesel in Indonesia is generally a mixture of biodiesel such as B30 to B35. This vegetable content makes the fuel’s characteristics different from pure diesel, especially in terms of stability and resistance to contamination. One weakness of biodiesel is its tendency to absorb water more easily. “Biodiesel tends to form deposits or sludge more quickly. These deposits can clog the filter and disrupt fuel flow to the engine,” said Muchlis, owner of the Toyota Mitsubishi Specialist Workshop, Garasi Auto Service Sukoharjo, to KOMPAS.com on Friday (24/4/2026). Another common issue is the growth of microorganisms in the tank. “An additional diesel filter with a water separator plays an important role in containing dirt deposits; this component is designed to separate water from the fuel before it enters the injection system,” said Muchlis. This additional filter, with its housing made of transparent material, allows drivers to see any deposits.