B15 biodiesel has officially been rolled out at fuel stations across Peninsular Malaysia from 1 June 2026. While most motorists are unlikely to notice any immediate difference, the move represents an important step in Malaysia's efforts to strengthen energy security, support the local palm oil industry and reduce reliance on imported fossil fuels.

So, what exactly is B15 biodiesel, and should diesel vehicle owners be concerned?

What is B15 biodiesel?

B15 is a diesel blend containing 15% palm-based biodiesel, known as Palm Methyl Ester (PME), mixed with 85% conventional petroleum diesel. Prior to this, diesel sold in Peninsular Malaysia contained up to 10% biodiesel under the B10 programme.

For most users, the transition is expected to be seamless. Modern diesel vehicles are already designed to operate with biodiesel blends, meaning motorists can continue refuelling as usual without any modifications to their vehicles.

Why is Malaysia introducing B15?

The government's decision to increase the biodiesel blend serves several objectives.

One of the primary goals is to reduce Malaysia's dependence on imported diesel by increasing the use of locally produced renewable fuel. This helps strengthen the country's energy security and reduces exposure to global supply disruptions and fuel price volatility.

The move is also expected to provide a boost to Malaysia's palm oil industry. Biodiesel production is projected to increase from approximately 534,000 tonnes under the B10 programme to around 801,000 tonnes under B15. Higher domestic demand for palm oil could provide additional support for plantations, refiners and smallholders throughout the supply chain.

Beyond economic considerations, biodiesel is also viewed as a lower-carbon alternative to conventional diesel. The initiative aligns with Malaysia's broader sustainability ambitions and supports the goals outlined under the National Energy Transition Roadmap (NETR).

Will B15 affect your vehicle?

This is likely the biggest concern among diesel vehicle owners.

According to the government, most modern diesel vehicles are already compatible with B15. In fact, higher biodiesel blends such as B20 have been introduced in selected locations including Langkawi, Labuan and Sarawak without any major vehicle-related issues being reported.

Many vehicle manufacturers also certify their diesel engines for biodiesel blends ranging from B10 to B20, particularly modern common-rail diesel engines found in popular pickup trucks, SUVs and commercial vehicles.

What about fuel economy and performance?

Because biodiesel contains slightly less energy per litre compared to conventional diesel, some motorists worry that fuel consumption could increase and operating costs may rise.

However, studies conducted on vehicles using B15 have generally found the impact to be minimal. Real-world testing has shown fuel consumption may increase by up to around 2%, while engine performance could decrease by approximately 1%.

In everyday driving, these differences are often difficult for drivers to notice and are typically outweighed by other factors such as traffic conditions, driving style and vehicle load.

More importantly, the small trade-off is accompanied by broader benefits. Research suggests B15 can help reduce carbon dioxide emissions by around 6% compared to lower biodiesel blends, while also supporting Malaysia's energy security and palm oil industry.