Japanese shipping giant NYK has launched a landmark one-year trial utilizing 100% pure biofuel (B100) on an operational car carrier to evaluate its long-term effects on ship engines and fuel systems. Moving beyond standard lower-concentration blends, this continuous, real-world test aims to tackle the chemical stability risks of high-purity FAME fuel and establish a definitive safety blueprint for deep-sea maritime decarbonization.
Tokyo | June 2, 2026 – In a major push toward deep-sea decarbonization, Japanese shipping giant Nippon Yusen Kaisha (NYK) has commenced a continuous, one-year trial utilizing 100% biofuel (B100) aboard an operational car carrier.
The year-long initiative marks a critical transition from short-term bunkering tests to long-term operational validation. It aims to comprehensively evaluate the safety, stability, and mechanical feasibility of high-purity marine biofuels under real-world, blue-water conditions.
Escalating the Biofuel Blend: From B24 to B100
While the maritime sector has increasingly turned to biofuels as a scalable, immediate solution to meet the International Maritime Organization’s (IMO) tightening greenhouse gas (GHG) intensity targets, most commercial applications to date have relied on lower-concentration blends.
NYK has spent the last few years incrementally scaling its biofuel exposure. Following successful sea trials in 2024 using a B24 blend (24% biofuel mixed with conventional very low sulfur fuel oil, or VLSFO), the shipowner subsequently expanded regular operations to B30 blends.
However, jumping to B100, unblended, 100% pure biofuel, presents a fundamentally different set of technical and chemical challenges for a vessel’s fuel treatment system and main machinery. Globally, data on the continuous, uninterrupted utilization of B100 over an extended twelve-month period remains exceedingly sparse.
Tackling the Chemical Vulnerabilities of Pure FAME
The fuel selected for this landmark trial is a Fatty Acid Methyl Ester (FAME), primarily derived from used cooking oil (UCO) and similar sustainable bio-feedstocks.
From a regulatory well-to-wake perspective, FAME offers a drastic reduction in lifecycle carbon intensity compared to traditional fossil fuels. It acts as a “drop-in” fuel, theoretically requiring no modifications to the vessel’s existing internal combustion engines or bunkering infrastructure.
Yet, high-purity FAME carries inherent chemical risks that NYK’s technical teams will monitor closely over the next year:
- Oxidation and Degradation: B100 is highly susceptible to degradation when exposed to oxygen, light, and heat over prolonged periods.
- Storage and Stability: In a ship’s fuel tanks, degraded FAME can form gums, sludge, and particulate matter that risk clogging fuel filters and injectors.
- Microbial Growth: Pure biofuels have a higher affinity for water absorption than conventional petroleum products, increasing the risk of microbial proliferation and subsequent tank corrosion.
Key Evaluation Parameters for the One-Year Trial
Throughout the 12-month deployment, NYK will systematically harvest operational data to address these vulnerabilities, focusing on three core areas:
| Focus Area | Technical Assessment Metrics |
| Engine Performance | Monitoring combustion efficiency, cylinder liner wear, and fuel injector fouling under continuous B100 load. |
| Fuel Supply Systems | Assessing the impact of high-purity FAME on fuel pumps, purifiers, filters, and piping materials (seals and gaskets). |
| Operational Practices | Establishing new onboard protocols for fuel storage management, temperature control, and long-term tank maintenance. |
Strategic Implications for the Global Fleet
As the shipping industry faces immense pressure to reduce its carbon footprint, NYK’s long-term trial is poised to provide the global maritime community with a definitive blueprint for high-purity biofuel adoption.
If successful, the trial will prove that B100 can be safely managed over long voyages without compromising engine reliability or vessel safety. This could significantly lower the industry’s reliance on fossil-fuel blends and accelerate the transition toward sustainable maritime transportation.
NYK has indicated that the data gleaned from this car carrier trial will directly inform its future technical evaluations and broader fleet-wide decarbonization strategy.
About NYK Line
Established in 1885 in Japan, NYK Line, formally known as Nippon Yusen Kabushiki Kaisha, has emerged as a global leader in the maritime industry over its 135-year history. Operating a diverse fleet, including container ships, bulk carriers, and tankers, NYK serves over 800 locations worldwide, offering a comprehensive suite of shipping services.
NYK Line has earned recognition for its commitment to innovation, sustainability, and safety, navigating the complexities of global logistics with diligence and foresight. This ongoing dedication underscores NYK’s pivotal role in shaping the future of ocean transport and reaffirms its status as a cornerstone of the maritime landscape.
Source: NYK Line