Introduction:
Two of the most common engine oils used by vehicle owners are 15W-40 and 5W-40. These two engine oils differ significantly when it comes to viscosity range and their properties. The choice of engine oil type and brand to use depends on several factors including engine type, age, use, climate and driving conditions among others.
In this article, we will compare 15W-40 Vs 5W-40 engine oils and help you make the right choice for your vehicle.
15W-40 engine oil:
15W-40 is a multi-grade oil with a viscosity range of 15 in cold temperatures and 40 in hot temperatures. This means that it is thicker in hot temperatures compared to cold temperatures. It is commonly used in diesel engines and works well in applications where a heavier oil viscosity is recommended.
It provides excellent protection to engines operating at high temperatures and pressures. It has high resistance to wear and tear due to its protective properties. It is ideal for use in heavy-duty engines as it can withstand high loads and stress.
One drawback of 15W-40 is that it can lead to poor fuel economy since it is a thicker oil. It can also cause a longer warm-up period due to its high viscosity.
5W-40 engine oil:
5W-40 is also a multi-grade oil with a viscosity range of 5 in cold temperatures and 40 in hot temperatures. This means that it is less thick in cold temperatures compared to 15W-40. It is commonly used in petrol engines and works well in applications where a lighter oil viscosity is recommended.
It provides excellent protection to engines in cold temperatures due to its low viscosity. It also has high resistance to wear and tear due to its protective properties. It is ideal for use in light-duty engines as it can withstand lower loads and stress.
One advantage of 5W-40 is that it can lead to better fuel economy due to its lighter viscosity. It can also cause a shorter warm-up period due to its low viscosity.
Comparison table:
Here is a table comparing the two engine oils:
15W-40 | 5W-40
:–|:–
Thicker oil viscosity | Lighter oil viscosity
Ideal for heavy-duty engines | Ideal for light-duty engines
Suitable for high loads and stress | Suitable for lower loads and stress
Suitable for hot climates | Suitable for cold climates
Poor fuel economy | Better fuel economy
Longer warm-up period | Shorter warm-up period
FAQs:
Q: What does the 15W-40 and 5W-40 mean?
A: The numerical values before the W represent the viscosity of the oil at low and high temperatures. 15W-40 means that the oil has a viscosity rating of 15 in cold temperatures and 40 in hot temperatures. 5W-40 means that the oil has a viscosity rating of 5 in cold temperatures and 40 in hot temperatures.
Q: Can I use 15W-40 in my petrol engine?
A: It is not recommended to use 15W-40 in petrol engines as it is too thick and can lead to poor fuel economy and longer warm-up periods. Using the wrong type of engine oil can also cause engine damage.
Q: Can I use 5W-40 in my diesel engine?
A: Yes, you can use 5W-40 in diesel engines as it provides excellent protection to engines in cold temperatures due to its low viscosity. However, it may not be ideal for heavy-duty engines that require a thicker oil viscosity.
Conclusion:
Deciding between 15W-40 and 5W-40 engine oils depends on several factors including engine type, age, use, climate and driving conditions. 15W-40 is ideal for heavy-duty diesel engines operating in hot climates while 5W-40 is ideal for light-duty petrol engines operating in cold climates. Always consult with a professional mechanic if you are unsure about which engine oil type and brand to use for your vehicle.