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Slow-speed engines
Our range of marine cylinder lubricants, Castrol Cyltech has been formulated to deliver 2-stroke engine cleanliness and control deposits.
Forward in protection, performance and reliability
To protect your slow-speed marine engines, you need specially selected technology that offers you engine performance and operational reliability.
Discover the evolved Castrol Cyltech range
Delivering 2-stroke engine cleanliness
The Castrol Cyltech range of cylinder oils has been formulated to deliver 2-stroke engine cleanliness and provide excellent control of piston ring and cylinder liner wear. Our products are available across a range of different base numbers spanning 40 to 140 BN. With approval from the major OEMs, the Cyltech range will meet all you slow-speed needs.
Castrol Cyltech range
Castrol Cyltech 40 XDC
Castrol Cyltech 40 XDC
- Category II 40 BN cylinder oil*
- Formulated for increased cleanliness in combustion cylinder
- Performance equal to or better than a category II 100 BN cylinder oil
- Approved across all MAN ES engines and recommended for Mark 9 and higher
- Category II lubricant for LNG and methanol**
No objection letters
- MAN ES category II
- Win GD
Marine fuels <0.5% sulphur
- MGO: marine gas oil, <0.1% sulphur (distillate)
- ULSFO: ultra low sulphur fuel oil, <0.1% sulphur (residual)
- VLSFO: very low sulphur fuel oil, <0.5% sulphur (residual)
Castrol Cyltech 40SX
Castrol Cyltech 40SX
- Bespoke detergency system for engine cleanliness
- Very good overall performance, especially deposit control
- Excellent performance at optimised feed rates
- Approved for use in Win GD DF dual fuel engines running on LNG
- Proven performance on biofuels (B30 and B50)***
No objection letters
- MAN ES category I
- Win GD DF
- JEC
Marine fuels <0.5% sulphur
- MGO: marine gas oil, <0.1% sulphur (distillate)
- ULSFO: ultra low sulphur fuel oil, <0.1% sulphur (residual)
- VLSFO: very low sulphur fuel oil, <0.5% sulphur (residual)
Castrol Cyltech 70f
Castrol Cyltech 70f
- Good performance at high temperatures
- Lubrication of low speed crosshead engines
- Suitable for use with compliant fuel and HSFO, subject to OEM recommendations and technical advice
No objection letters
- MAN ES category I
- Win GD
- JEC
Marine fuels <0.5% sulphur
- MGO: marine gas oil, <0.1% sulphur (distillate)
- ULSFO: ultra low sulphur fuel oil, <0.1% sulphur (residual)
- VLSFO: very low sulphur fuel oil, <0.5% sulphur (residual)
HSFO with scrubbers >0.5% sulphur
- HSFO: high sulphur fuel oil
Castrol Cyltech 100f
Castrol Cyltech 100f
- Protection against corrosive wear
- Excellent control of piston ring and cylinder liner wear
- Helps extend periods between unit overhauls
- Granted category II status – latest performance category from MAN ES
No objection letters
- MAN ES category II
- Win GD
- JEC
HSFO with scrubbers >0.5% sulphur
- HSFO: high sulphur fuel oil
Castrol Cyltech 140
Castrol Cyltech 140
- Improved protection of cylinder liners in engines operating under corrosive conditions with lower feed rates compared to 100 BN oils
- Protection against corrosive wear
- Excellent control of piston ring and cylinder liner wear
- Granted category II status – latest performance category from MAN ES
No objection letters
- MAN ES category II
HSFO with scrubbers >0.5% sulphur
- HSFO: high sulphur fuel oil
Protection, performance and reliability
Castrol Cyltech has a long history supporting 2-stroke reliability
Our cylinder oil is trusted by 500+ marine customers
Used in over 8,000 vessels
Annually, Cyltech has performed for 34 million voyage hours†
Approvals achieved as a result of 75,000 hours of field testing
Available in 800 ports worldwide
Optimal solutions for 2-stroke engines
Engines face lubrication challenges due to varying fuel sulphur levels, feed rate optimisation requirements and operational conditions. Our range of 2-stroke marine engine lubricants, Castrol Cyltech, provides optimal protection against corrosive and mechanical cylinder wear.
We have formulated every product in this range with special care to ensure you get the right balance of base numbers (BN) and detergency to protect your engines.
Combine the right product with an active monitoring programme
No two vessels are the same, which means you can’t afford to make assumptions about BN levels across all cylinder lubricants. Castrol Technical Services can help ensure you are using the appropriate lubricant, along with the right feed rate, and monitoring approach to maximize long-term performance. We have got an unbeatable depth of engineering knowledge and skills to work with you on a one-to-one basis. Our SmartGains methodology is designed to maximize the operation and productivity of your asset, prevent unnecessary costs and delays, and optimize the ordering process. And with LabCheck it’s easy for you to get the right data at the right time, identify every potential saving, and minimize unplanned downtime.