17.10.2026

Fuel oil 380 cSt (ISO 8217 RMG 380)

Fuel oil 380 cSt is a heavy residual fuel with a maximum kinematic viscosity of 380 mm²/s at 50 °C, specified for marine use as grade RMG 380 in ISO 8217. It is used for ship propulsion, power generation and industry.

Key ISO 8217:2024 limits, RMG 380 (0.50 % sulfur fuel)

Parameter	Limit
Kinematic viscosity at 50 °C	max 380 mm²/s
Density at 15 °C	max 991.0 kg/m³
CCAI	max 870
Sulfur	max 0.50 % m/m
Flash point	min 60 °C
Hydrogen sulfide	max 2.00 mg/kg
Acid number	max 2.5 mg KOH/g
Total sediment, aged	max 0.10 % m/m
Carbon residue (micro method)	max 18.00 % m/m
Pour point	max 30 °C
Water	max 0.50 % v/v
Ash	max 0.100 % m/m
Vanadium / Sodium / Aluminium plus silicon	max 350 / 100 / 60 mg/kg

Limits for 0.50 % sulfur residual fuel as given in a supplier data sheet citing ISO 8217:2024. Limits for high-sulfur RMG 380 differ; check the standard's tables. Sources: BPCL VLSFO data sheet.

Sulfur rules

Under MARPOL Annex VI, ships may burn fuel with at most 0.50 % m/m sulfur outside Emission Control Areas (since 1 January 2020) and 0.10 % m/m inside them, unless they use approved exhaust cleaning systems. Source: IMO.

What "D6" means in offers

"D6" in broker offers is often used loosely for an unspecified heavy residual fuel and usually does not refer to fuel certified to ASTM D396 grade No. 6. The defining ASTM D396 No. 6 limits are a viscosity of 15.0 to 50.0 mm²/s at 100 °C, a flash point of at least 60 °C and water and sediment of at most 2.00 % by volume. If an offer says "D6", ask which standard and test results it refers to.

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