French testing, inspection and certification firm Bureau Veritas recently provided Singapore bunkering publication Manifold Times a copy of its VeriFuel Fuel Quality Testing Q2 2026 Report which provides an overview of marine fuel quality, emerging trends, and compliance levels based on all tested bunker samples across its laboratories. The following is an overview of the report:
VLSFO
Global Quarterly Averages
Global VLSFO quality indicators in Q2 2026 remain stable. Viscosity, density and cat fines have slightly increased compared to Q1 2026. The overall off-spec rate increased slightly to 1.5%, although still remaining within historical norms.
Global Monthly Averages
Monthly data for Q2 2026 show relatively limited variability across all key parameters. Viscosity increased progressively from April to June, while sulphur and sediment levels remained stable. Off-spec incidence declined throughout the quarter, suggesting an improvement in regards to ISO.
Global Quarterly Pour Point Distribution
The pour point distribution in Q2 2026 remains largely consistent with previous quarters. Majority of samples continue to fall within low temperature ranges (≤ 21 °C) while cases at or slightly above limit are very limited.
Global Quarterly Out-of-Spec Parameters
Sulphur, water, sediments and cat fines continue to represent the primary causes of VLSFO non-compliance in Q2 2026 while the ratio of all properties have increased compacted to Q1 2026.
VLSFO 0.50% Port Averages
Regional variations remain evident across fuel properties. Elevated Al+Si levels continue to be observed in ports such as Port Klang and Singapore, while sediment-related concerns were identified in several European locations. Sulphur remains the most commonly reported cause of non-compliance across major bunkering hubs.


Sediments by Quarter
The percentage of fuels exceeding the sediment threshold (≥0.07% m/m) increased compared to Q1 2026. While most fuels remain within ISO 8217 limits, the rising trend highlights the continued importance of good housekeeping and management on board vessels. Most notable increase is observed in Gothenburg and Skagen.
Cat Fines (Al+Si) by Quarter
The proportion of VLSFO samples containing elevated cat fines increased slightly during Q2 2026. Although most fuels remain compliant with ISO 8217 limits, proper treatment on board remain a critical aspect in order to meet engine manufacturer recommendation of max 10 mg/kg at engine inlet.
Acid Number by Quarter
Acid number levels in Q2 2026 remain generally stable and well below the 1.2 mg KOH/g threshold for the majority of samples. However, isolated ports continue to report elevated average acid numbers, particularly in Singapore and Zhoushan, warranting ongoing monitoring of blend composition and feedstock sources.
HSFO
Global Quarterly Averages
HSFO quality indicators in Q2 2026 remained generally stable. Sulphur content continued its downward trend and density declined slightly, while cat fines increased. The overall off-spec rate increased significantly to 2.4%, representing the highest level observed since early 2024 and indicating a deterioration in overall conformity.

Global Monthly Averages
Monthly trends during Q2 2026 show limited parameter variability, with sulphur decreasing steadily from April through June. Off-spec frequency increased sharply after April and remained elevated during May and June, suggesting persistent quality challenges during the quarter.

Global Quarterly Out-of-Spec Parameters
Water, density, sediments and viscosity remain the leading contributors to HSFO non-compliance in Q2 2026. Compared with previous quarters, water is noted as the leader cause of ISO8217 non-compliance followed by sediments.
HSFO 0.50% Port Averages
Significant regional variability continues to be observed in fuel properties. Several ports such as New Orleans, Houston, Balboa and Algeciras reported average Al+Si levels approaching or exceeding 36 mg/kg. Water and sediment lead as the most frequent non-compliant properties across most locations.
Sediments by Quarter
The proportion of HSFO samples exceeding the sediment threshold (≥0.07% m/m) increased further during Q2 2026 compared with both Q1 2026 and the corresponding quarters of 2025. The rising trend highlights the continued importance of good housekeeping and management on board vessels.
Cat Fines (Al+Si) by Quarter
The proportion of HSFO samples containing elevated cat fines increased slightly during Q2 2026. Although most fuels remain compliant with ISO 8217 limits, proper treatment on board remain a critical aspect in order to meet engine manufacturer recommendation of max 10 mg/kg at engine inlet. Most notable increase was observed in Damietta, Houston and New Orleans ports.
Acid Number by Quarter
Acid number above 1.2 mg KOH/g remain concentrated in a limited number of regions. ARA, Singapore and Zhoushan are the most notable for which some extra attention is required especially related to the fuel composition and nature of acids origin in the fuel.

DMA
Global Quarterly Averages
Global DMA quality indicators in Q2 2026 remained stable. Viscosity increased slightly compared with Q1 2026, while sulphur content declined and cetane index remained unchanged. The overall off-spec rate slightly improved to 2.4 compared to previous quarters.
Global Monthly Averages
Monthly averages for Q2 2026 demonstrate limited variation across fuel properties. Off-spec frequency remained relatively moderate with no clear upward or downward trend throughout the quarter.
Global Quarterly Out-of-Spec Parameters
Appearance usually combined with water as well as pour point and sulphur remain the principal contributors to DMA non-compliance in Q2 2026. Based on individual values the Pour Point and Sulphur are considered of higher importance compared to water content.
DMA 0.10% Port Averages
Substantial regional differences remain evident across regions. Water continues to be the most frequently reported cause of non-compliance across several major bunkering locations, while isolated cases of viscosity, sulphur and pour point related non-conformities persist.
CFPP by Quarter
The proportion of DMA samples with CFPP values exceeding 6°C increased slightly during Q2 2026. This reflects seasonal and regional supply effects and emphasizes the importance of selecting fuels appropriate for the expected operating regions.
Pour Point by Quarter
Pour point exceedances above 0°C remain present in Q2 2026 and show a slight increase compared with Q1 2026. Although cases are limited, operators should continue considering ambient conditions when planning fuel procurement.
Water by Quarter
The proportion of DMA samples containing water in excess of 300 mg/kg remained a recurring concern in Q2 2026. Water-related non-compliance continues to be mainly associated with European and Mediterranean supply locations, reinforcing the importance of good storage, transfer and housekeeping practices. At least positive remain the fact that operational issues due to water presence remain limited.
Photo credit: Bureau Veritas
Published: 28 July, 2026