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Mobilgard™ 300 C system oil
Mobilgard™ 300 C is a next-generation system oil specially engineered to help improve cleanliness in two-stroke crosshead diesel engines. Its balanced formulation combats deposits and sludge buildup, especially in the most susceptible engine components – such as the piston undercrown and crankcase.
Mobilgard 300 C system oil may help:
- Result in cleaner engine components, helping bearing and gear life
- Provide balanced anti-wear protection, even under high loads and at extreme temperatures
- Protect against rust by enabling water separation
- Extend maintenance intervals and lower operational costs
Mobilgard 300 C has received No Objection Letters from MAN Diesel & Turbo and WinGD (formerly Wärtsilä).
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Data Sheet
Product data sheet (PDS) 
Safety data sheet (SDS) Product Information
921.517 KB/pdf
Technical resources
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Learn about five different circumstances related to switching and mixing ExxonMobil marine lubricants.
Features and Benefits
The high quality paraffinic base oils used in Mobilgard 300 C have excellent thermal stability and oxidation resistance. The formulation includes proprietary detergent and anti-wear additive systems to deliver enhanced crankcase cleanliness, along with excellent protection for highly-loaded engine parts. Mobilgard 300 C also provides good rust protection in case of water contamination, and excellent water separation characteristics.
When used as recommended in crosshead type diesel engines, Mobilgard 300 C system oil offers the following features and potential benefits:
| Features | Advantages and Potential Benefits |
| Enhanced detergency and improved thermal and oxidation stability | Reduced deposits in piston cooling spaces Better piston cooling efficiency Cleaner crankcases and circulation tanks |
| Enhanced load-carrying and anti-wear performance | Excellent protection for highly loaded engine components such as bearings and gears |
| Excellent rust and corrosion properties | Longer bearing life Protects critical bearing surfaces |
| Good water tolerance and separation capability | Effective lubrication in the presence of water Longer oil life due to efficient water separation |
Applications
Mobilgard 300 C is recommended primarily for use as system oil in late model, high-output, crosshead diesel engines, especially those engines employing the system oil for piston cooling. It will prevent or reduce deposit formation in the piston cooling spaces, thus maintaining piston cooling efficiency and reducing the incidence of piston top burning and piston crown cracking. It will also prevent or reduce crankcase deposits and will provide outstanding protection for heavily loaded bearings and gears. Good rust prevention and water separation characteristics make Mobilgard 300 C an excellent system oil in older design crosshead diesel engines which have water-cooled pistons and where crankcase deposits can be a problem with lower-quality system oils.
Typical Properties
| SAE Grade | 30 |
| Specific Gravity at 15ºC | 0.8665 |
| Flash Point, ºC, ASTM D 92 | 245 |
| Pour Point, ºC, ASTM D 97 | 24 |
| Viscosity, ASTM D 445 | |
| cSt, at 40ºC | 109 |
| cSt, at 100ºC | 11.9 |
| Viscosity Index, ASTM D 2270 | 98 |
| TBN, mg KOH/g, ASTM D 2896 | 9 |
| Sulphated Ash, wt%, ASTM D 874 | 1.06 |
| FZG Scuffing, Fail Load Stage, A/8.3/90, ISO 14635-1 | 12 |
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