Mobilgard™ M440 — 40 BN Medium-Speed Trunk Piston Engine Oil | Residual Fuel

40 BN

TBN mgKOH/g

SAE 40

Grade

Residual

HFO — High S

DAC

Patented Test

MAN ES

Approved

Wärtsilä

Approved

40 BN — Maximum Acid Neutralisation

Highest TBN in the M-Series — 40 mgKOH/g provides maximum acid neutralisation capacity for engines burning higher-sulphur residual fuels or operating under the most severe conditions where 30 BN M430 may be insufficient.

Outstanding Residual Fuel Compatibility

High performance additive detergent technology provides outstanding fuel-lube compatibility — preventing asphaltene sludge formation and enabling longer oil life in the most severe HFO-fuelled medium-speed applications.

Excellent Engine Cleanliness

Reduced deposits in piston undercrown and ring belt areas — keeping crankcase, camshaft and piston areas clean for extended overhaul intervals in the harshest residual-fuelled medium-speed marine engine applications.

ExxonMobil Patented DAC Test

Developed using the patented DAC (Detecting Asphaltene Contamination) test — detecting asphaltene contamination that could cause piston damage and excessive oil consumption if undetected in high-sulphur fuel operation.

High Performance Thermal Stability

Excellent TBN retention and resistance to viscosity increases over long operating periods — maintaining consistent protection throughout extended drain intervals even in the most demanding residual fuel conditions.

Excellent Lube-Fuel Compatibility

Outstanding fuel-lube compatibility and easy water separation — critical for vessels operating on varied residual fuel qualities and sulphur levels through different African ports.

High-Sulphur HFO Operations

Medium-speed engines operating on higher-sulphur residual fuels — where the 40 BN provides greater acid neutralisation capacity than the 30 BN M430 for more aggressive sulphuric acid neutralisation requirements.

Most Severe Residual Fuel Applications

The most demanding medium-speed residual-fuelled applications in deep-sea shipping, coastal vessels and stationary power generation — where maximum TBN and cleanliness performance is required.

FPSO & Offshore Power

Medium-speed diesel generator engines on FPSOs and offshore platforms operating on high-sulphur residual fuel — where maximum TBN reserve is critical for extended continuous duty operation.