Product Description

Mobilgard 525 is a marine diesel engine cylinder oil for crosshead engines running low and ultra low sulphur distillate fuels and meets the requirements of MAN and Wartsila engines. Designed to protect in extreme environments, Mobilgard 525 has an optimum viscosity of 20 cSt at 100ºC and low volatility to ensure lubricant distribution and oil film retention and help protect engine parts.


     •  Combats the deposits and scuffing related engine wear associated wth low sulphur fuels

     •  Excellent thermal and oxidative stability to ensure performance in a variety of engine conditions

     •  Formulated with detergent technology required to deliver excellent performance with low-sulphur fuel

     •  Detergency system provides strong control of piston groove deposits which is a critical area for distillate fuel operation

     •  Marine crosshead engines designed for increased power and fuel efficiency

     •  Earlier engine designs and engines in slow speed steaming operation

Specifications and Approvals

This product has the following builder approvals:

MAN B&W 2-Stroke Diesel Engines

WARTSILA & Sulzer 2-Stroke Engines <0.5% max. Sulfur Distillate Fuel

Properties and Specifications



SAE 50

Flash Point, °C, ASTM D92


Kinematic Viscosity @ 100 C, mm2/s, ASTM D445


Kinematic Viscosity @ 40 C, mm2/s, ASTM D445


Pour Point, °C, ASTM D97


Specific Gravity, 15 C/15 C, ASTM D4052


Total Base Number, mgKOH/g, ASTM D2896


Viscosity Index, ASTM D2270


Health and safety

Health and Safety recommendations for this product can be found on the Material Safety Data Sheet (MSDS) @


It cannot be guaranteed that the product information given above is up to date. For the latest version of the Product Data Sheet we refer to the product library of ExxonMobil.