46
Multi graded oils are generally produced by adding viscosity index improver
additives to retard the thinning effects that the low viscosity base oil will experience
at engine operating temperatures. Multi graded oils that meet the requirements of
the API classications, are recommended for use in engines.
It is recommended to use the multi graded lubricating oil with the viscosity grade
as table 6.2.
GUIDELINES TO SELECT OIL VISCOSITY ACCORDING TO AMBIENT
TEMPERATURE
Engine oil
SAE viscosity grade
Applicable ambient
temperature range(°C)
5W/30 -30~35
10W/30 -25~35
15W/40 -20~40
20W/50 -15~50
Gear oil
85W/90 -15~49
80W/90 -25~49
85W/140
(above 85W/90)
-15~49
Table 6.2
6.2 Engine oil recommendations for Weichai engines
Quality of lubricating oil is one of the key drive factors to decide the performance,
durability and total cost of operating of diesel engine. Hence, we have always been
recommending the best available/suitable engine oil to be used in our engine.
Lubricating oil has also undergone various improvements to meet the requirements
of these changes in diesel engine technology. With this, SAE 15W40 grade
lubricating oil with API, CH4, CI4+ classication is now available in India from most
of oil companies. This is the best engine oil currently available in India.
This provides several advantages such as,
1. Reduced wear and tear of internal moving parts like piston rings, Liner, bearing,
shaft etc
2. Better oxidation stability at high temperature
3. Stabilized engine temperature on higher loads
4. Optimum lube oil consumption
5. Better emission control
6. Improved detergency for better cleanliness of internal passages and
components
7. Less sludge formation due to improved dispersancy
8. Improved capability on acid neutralization formed during combustion process,
resulting in less corrosion damage in internal engine components.
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