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Marine engine oil ingredients

The International Maritime Organisation’s (IMO) 2020 international convention was designed to reduce pollution from shipping. The focus of the convention was to reduce sulphur emissions from the main propulsion engines of marine vessels. Because most ships use fuel oil – which is high in sulphur – it has forced ship operators to modify either their engines (installing scrubbers) or modify their fuels.

Two-stroke marine diesels are the workhorses of the sea. Powering the majority of long-range container ships and bulk carriers, we have come to depend on their blend of low fuel costs and economy to drive global trade.

As low sulphur fuel oil has become more available, most ship operators have chosen to use this, rather than go down the expensive route of installing scrubbers or converting to other fuel sources.

the engine of a ship

Cylinder liner wear in two-stroke marine engines 

Cylinder liner wear has always been a topic of concern within two-stroke marine engines: whenever two surfaces slide over each other, friction is produced which leads to wear. Wear is expected in cylinder liners and regular maintenance is carried out as part of standard engine services. Factors that can affect wear include catalyst fines in fuels, the oil feed rate to the cylinder and oil specification, engine load, pressure, temperature and combustion efficiency.

The move to low sulphur fuels appears to have increased cylinder wear issues and many shipping companies are now reporting more and more serious incidences of adhesion and scuffing damaged, caused by the momentary welding of the piston rings to the cylinder liner.   This damage requires additional maintenance, some of which may be unscheduled.

Costs to repair wear and damage

Significant costs are associated with cylinder liner wear and include the dry dock time, cylinder liner service and, in extreme cases, the complete replacement of a cylinder liner. 

The cost to rectify this damage may exceed 1 million dollars for a large container ship and of course a premium is paid on top for unscheduled, emergency maintenance.

Using REWITEC™ surface repair additives to prevent and repair damage to marine cylinders

We offer a unique lubricant technology - a silicate lubricant additive with specific repair and protect effects for marine cylinder liners. REWITEC technology can repair damage and improve cylinder condition, removing cylinder glazing and restoring the cylinder liner surface.. We can reduce your overall maintenance costs and lost revenue by increasing uptime. This is a unique effect for a complex and critical issue in two-stroke marine engines. REWITEC can be added directly to the cylinder oil for two-stroke marine engines or we can provide custom products to your specifications.

close up of general gearbox

REWITEC surface repair additives

Improve the longevity of machinery and gearboxes with our range of nano- and micro-particle based lubricant additives.
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