ExxonMobil Mobilgard 540 AC Cylinder Oil
Specifications
| OEM | ExxonMobil Marine | |
|---|---|---|
| Product type | Slow-speed two-stroke crosshead (cylinder) oil | |
| Base Number (BN) | 40 mg KOH/g | |
| SAE viscosity grade | SAE 50 | |
| Kinematic viscosity @ 100C | 19 mm2/s (cSt) | |
| Kinematic viscosity @ 40C | 218 mm2/s (cSt) | |
| Density @ 15.6C | 910 kg/m3 | |
| Flash point (PMCC) | 207 C | |
| Intended fuel/application | MAN ES 2-stroke engines on <0.50%S fuels (VLSFO), LNG, ethane, methanol and LPG; WinGD/Wartsila/Sulzer 2-stroke engines on <1.50%S fuels, LNG and methanol | |
| Engine-OEM approvals | MAN Energy Solutions Category II (Mark 9 and higher 2-stroke, including dual-fuel); WinGD Ltd. LNG/Dual-Fuel validated |
Technical notes
Mobilgard 540 AC is a 40 BN, SAE 50 cylinder oil and one of the first 40 BN lubricants granted MAN Energy Solutions Category II status for newer-generation (Mark 9 and higher) MAN ES two-stroke engines, including dual-fuel variants, plus WinGD LNG/dual-fuel validation. Its lower reserve alkalinity suits low-sulphur and gas-mode operation: VLSFO at or below 0.50%S (MAN ES) or 1.50%S (WinGD/Wartsila/Sulzer), LNG, ethane, methanol and LPG. A balanced detergency formulation maintains piston and liner cleanliness at optimised feed rates while neutralising residual acidity in gas mode. Because BN, feed rate and fuel sulphur must be matched to the specific engine, final grade selection must be confirmed with the engine OEM and with ExxonMobil.
Compliance
Holds MAN Energy Solutions Category II status (Mark 9 and higher 2-stroke, including dual-fuel) and WinGD LNG/dual-fuel validation for low-sulphur, LNG, methanol, ethane and LPG operation.
Compatibility
Other parts in this series
Related
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Frequently asked questions
- What is the Base Number (BN) of Mobilgard 540 AC?
- It is a 40 BN cylinder oil (40 mg KOH/g), confirmed by the ExxonMobil product data sheet.
- What fuels and engines is Mobilgard 540 AC for?
- It is a Category II SAE 50 cylinder oil for newer MAN ES (Mark 9 and higher) two-stroke engines on <0.50%S fuels, LNG, ethane, methanol and LPG, and WinGD/Wartsila/Sulzer two-stroke engines on <1.50%S fuels, LNG and methanol. Confirm selection, feed rate and BN with the engine OEM and ExxonMobil.
- What viscosity grade is Mobilgard 540 AC?
- SAE 50, with a kinematic viscosity of about 19 cSt at 100C.
ExxonMobil Mobilgard 540 AC Cylinder Oil
No public pricing — quoted per request