Mobilgard™ 525 cylinder oil

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MobilGard™ advantages

MobilGard™ is the flagship of marine engine oils from ExxonMobil. It is supported by over 60 years of engineering excellence and lubrication technology.

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Data sheets

Product Information

Technical resources

  • Combats the deposits and scuffing related engine wear associated with 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

Mobilgard 525 has the following builder approvals


** Please refer to latest service bulletins from Wartsila Switzerland for lubrication requirements.

To ensure achieving the maximum equipment life possible as well as appropriate feedrates, particular attention should be paid to the manufacturer's special recommendations as published in the references as above or any other future manufacturer’s instructions.

Typical Properties

SAE Grade 50
Specific Gravity at 15ºC 0.909
Flash Point, ºC, ASTM D 92 286
Pour Point, ºC, ASTM D 97 -9
cSt, at 40ºC 226
cSt, at 100ºC 20
Viscosity Index, ASTM D 2270 102
TBN, mg KOH/g, ASTM D 2896 25

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