User Guide

How to choose coolant and anti-freezer?

Coolant & Anti-Freezer

Cooling water: rainwater, tap water or clean river-water is preferred as the cooling water. However, tap water with well-water as its source, or well-water, which both contain more minerals, should not be used; otherwise, inside the engine cooling system, more water-scale will be produced, thus cooling effectiveness will be affected and engine be troubled. In winter when the temperature is very low, it is possible to add some anti-freeze liquid to prevent freezing. Most commonly used anti-freeze liquid is ethylene glycol (glycol) water solution or alcohol. When ambient temperature is below 0℃ and the engine has difficult in starting, cooling water can be heated to higher than 80℃ so that it can be used normally.


Selection of cooling water:

For engines with advanced water-cooling, its cooling system have a very high requirement for cooling medium used. Please use the coolant, dedicated to Brand Xichai diesel engines. This coolant, conforming to National Standard SH0521-92, not only has an anti-freezing capability and has a freezing point of -3.5℃~-4℃, but also has a boiling as high as 107℃~108℃, effectively preventing the evaporation of water. Also, it can prevent water-scale and prevent the cooling water from forming water-scale and bubbles, by which the cooling effectiveness is improved. In addition it has long-term effective anti-rust and –corrosion characteristics. This coolant is suitable for the cooling system of all types of diesel engines, and can be used throughout the year, and has a preservation period as long as 1.5~2 years. The coolant dedicated to Brand Xichai diesel engines, which contains water (distilled water or ion water), additives and ethylene glycol, can directly be add into the cooling system.

Its specific parameters and quality indexes as follows:


Coolant Brand






No peculiar Odor

Freezing point (℃)



Boiling point (℃)

107 108

Influence on organic   coatings

No influence

PH Value


Corrosion test:

Varied value on test   strip (mg/strip)




Cast iron

Soldering tin








● High boiling temperature

● Freeze protection

● Corrosion protection

● No foaming

● Scale and deposit prevention

● Basic organic chemistry

● Lower cost


How to choose engine oil?


Correct selection of engine oil directly helps ensure reliable working and prevention of parts from being abnormally worn-off. A natural air-intake type engine should use oil of Class CC (or Class CD),while a supercharge type engine should use oil of Class CD. In addition, selection of engine oil brands also bases on engine operating ambient temperature (see Table 2-2). For example, 15W/40oil should be selected for Class CC or CD, when ambient air temp is – 15℃.


If ambient temperature occasionally exceeds its limit, only starting performance will be affected, and the engine will not be damaged. Engine oil should be kept clean, free of pollution by dust or impurities. After the engine oil is added, it is necessary to inspect the oil level inside the crankcase sump as follows: pull out the oil dipstick and clean it with gauze, then insert it back; pull it out again and inspect if the oil-level indication is between the upper limit and lower limit.


The oil level should at any time be on lower than the lower-limit on oil dipstick.

Table 2-2 Relations between engine oil brands and suitable lowest temperature

Oil brand







Engine's operating ambient temp.(℃)








For ensuring that the diesel engines properly operate and have a longer service life as well as emission of engines is improved, please use Class CC and CD lube oil, dedicated to Brand Xichai diesel engines. This lube oil meets GB11122-1997 National standard for Diesel Engine Oil, and its performance conforms to Class CC and CD of American Petroleum Institute (API), and conforms to Viscosity Class SAE30,40,15W40 and 20W50 of standard of the Society of Automotive Engineers(SAE),USA.


1. Engine oil quality and class should be selected according to engine model/type and automobile model/type.

2. Viscosity class should be selected according to ambient temperature.

3. Higher class (one class higher than normal required class) oil should be used, when load is heavy or travel distance is long, or where road condition is bad or in dusty regions.

4. Recommended are CD15W40 and CD20W50 engine oil with several viscosities, which not only have low-temperature dynamic viscosity and low-temperature boundary pumping performance, but also have such high-temperature characteristics as high-temperature shear stability, high-temperature viscosity and evaporation loss etc, ensuring engines to be reliable.


Specification & applicable scope of lube oil, dedicated to diesel engines.

Oil Spec. / Application   scope





Service ambient   temperature





Suggested oil-change   interval

6000~8000 km

10000 km

Suitable engine model /   Type of vehicle

Natural aspiration, low   supercharging 4DW/ agriculture vehicles, light-weight trucks

Mid supercharging 4DW/   passenger buses, light-weight vehicles



● Cleanness

● Lubricating performance

● Cooling performance

● Corrosion protection

● Heat radiation