• Mixed with the appropriate amount of water, Havoline XLI is recommended as a coolant, flushing fluid or hot test fluid for engine blocks and cooling systems.  During extensive field testing, the synergistic combination of mono- and di-carboxylic additives has proven to offer protection for at least 32,000 hours in marine and stationary applications
• Havoline XLI promotes long-life protection against corrosion through the use of optimised and patented organic corrosion inhibitors. Havoline XLI contributes to long-life protection to aluminium heat transfer surfaces contained in modern engines. The inhibitor package of Havoline XLI aids cavitation protection without nitrite or nitrite-based supplemental coolant additives (SCA’s)
• Havoline XLI promotes long-life corrosion protection. Depending on the actual application the dosage may vary from 5 - 10 % but a minimum of 5 vol. % of Havoline XLI in water should be used. Havoline XLI may be used in engines manufactured from cast iron, aluminium or combinations of the two metals, and in cooling systems made from aluminium or copper alloys. The correct dosage of Havoline XLI may be established with a refractometer reading
• Havoline XLI is recommended for hi-tech engines such as race cars and heavy duty off-road equipment, where high temperature aluminium protection is important
• In marine applications, the concentration of Havoline XLI should not be lower than 5 vol. %. At this dosage the recommended life-time is at least 32,000 hours. If Havoline XLI is replenished regularly to compensate for leakage, the cooling water can be considered as fill for life
• Small marine engines sometimes require limited frost protection. This can be obtained by using the adequate dosage of Havoline XLC, based on ethylene glycol, supplemented with 5 % vol. Havoline XLI. For frost protection of -10°C and -15°C, the required XLC dosages are respectively 22 and 29 vol. %.
• For off-road, truck and bus applications the recommended life time is 8,000 hours or 650,000 km, provided a concentration of 7.5 % vol. Havoline XLI is used
• At 7.5 % vol., Havoline XLI will provide corrosion protection in stationary engines for at least 32,000 hours
• Havoline XLI can also be used at 10 % vol. as a hot test liquid for new engine blocks. Newly manufactured engines are tested for a duration of approximately 5 to 10 minutes, after which the fluid is drained and usually reused. If the engine blocks are not immediately built into vehicles, Havoline XLI will provide corrosion protection for the engine for up to two months
• At 5 % vol. Havoline XLI performs as a flushing fluid to clean cooling systems that were filled with other inhibitor packages. In most cases it is required to flush the system twice. For a good result it is important that the engine has reached normal operating temperatures and all thermo-valves are opened
• Havoline XLI can also be used as an inhibitor package for central heating systems, as a hydraulic safety and mining fluid
• The use of soft water is preferred for dilution. Laboratory testing has shown that acceptable corrosion results are still obtained with water of 20°dH, containing up to 500 ppm chlorides or 500 ppm sulphates. The water used for dilution should be free of zinc as the presence of zinc will result in the formation of a precipitate
• This product is compatible with glycol-based engine coolants. It is recommended to change the coolant every five years or at above operating times, whichever comes first
  

• Advanced synergistic additive technologies contributes to extended, low maintenance corrosion protection, helping increase uptime
• Promotes high performance protection in thermostats, radiators, water pumps and other vulnerable cooling system components
• Helps provide effective protection to a wide range of metals including aluminium, iron, copper and solder alloys
• Aids performance and cooling system protection in modern high temperature aluminium engine environments
• High technology non-depleting inhibitors aid consistent long-life performance and protection
• Silicate and phosphate-free technology offers good, stable dilution in harder waters 
  

Havoline XLI has been approved by several engine manufacturers and an up-to date list with approvals is available separately.

Even though some OEMs have not yet given a formal approval, Havoline XLI is suitable for use in the applications as described in this PDS.