A comprehensive guide to changing the viscosity of engine oil: When and why?
Engine oil is an essential element for maintaining the performance of the car and the efficiency of the engine, as it works to reduce friction, cool, and clean the internal parts of the engine. Over time and increasing the number of kilometers driven, it may be necessary to change the viscosity of the oil from light to heavy oil to ensure the best performance of the engine, especially in hot weather conditions such as summer.
In this article, we will discuss when to change the viscosity of engine oil? What is the appropriate oil for engines after 200,000 kilometers? What are the signs of oil expiration?
When to change the viscosity of engine oil from light to heavy?
It is recommended to use light oil in new engines because it helps reduce friction and improve fuel efficiency. However, over time and increasing the distance driven, the engine may require a more viscous (heavy) oil due to slight wear on the internal parts of the engine.
✔ Best time to change oil from light to heavy:
After 200,000 km: When the engine reaches this distance, there is slight wear on internal parts such as rings and valves, which increases oil consumption.
When oil pressure drops: If you notice a drop in oil pressure or hear the engine sound more than usual, it may be time to use a more viscous oil.
In hot weather: In the summer, it may be better to use a higher viscosity oil such as 20W-50, especially in hot areas such as the Arabian Gulf.
Increased oil consumption: If you need to refill the oil frequently, this indicates that light oil may not be sufficient for the consumed engine.
What is the right oil for engines after 200,000 km?
After the car has traveled long distances (200,000 km or more), experts recommend using high-viscosity oils, such as:
🔹 20W-50 - Suitable for hot areas and for engines that suffer from excessive oil consumption.
🔹 10W-40 – A medium option, providing a good balance between performance and viscosity.
🔹 15W-40 – Used in engines that need a thicker oil without being too heavy.
✅ Why is 20W-50 chosen for older engines?
Provides greater engine protection at high temperatures.
Reduces oil leakage in worn engines.
Maintains proper oil pressure inside the engine.
Table of suitable oil viscosity grades according to temperature
Oil viscosity Suitable temperature
0W-20 / 5W-30 Cold temperatures and very cold areas
10W-30 / 10W-40 Moderate or variable climate
15W-40 / 20W-50 High temperatures and hot environment
💡 Tip: If you live in a hot area like Saudi Arabia, it is better to use 15W-40 or 20W-50, especially in engines that have traveled long distances.
The most important signs of engine oil expiration
Even if you are using the right oil for your car's engine, not changing it on time can cause serious problems such as sediment buildup, engine overheating, and reduced performance efficiency. Here are some signs that indicate the need to change the oil immediately:
🚨 1. Oil color changes - If the oil becomes very dark or has impurities, this indicates its wear.
🚨 2. The oil level is constantly low - indicates excessive oil consumption due to inappropriate viscosity or leaks.
🚨 3. Abnormal sounds coming from the engine - This could be a result of poor lubrication due to old oil.
🚨 4. Blue smoke coming out of the exhaust - indicates that the oil is burning inside the engine, which is an indication of the need to change the oil to a higher viscosity.
🚨 5. The car shakes when starting - This could be due to the oil not flowing smoothly inside the engine.
When should the car oil be changed?
The oil change period varies depending on the type of car, the age of the engine, and driving conditions, but the general rule is:
🔧 New cars: Experts recommend changing the oil every 6 months or after driving 10,000 miles (16,000 km).
🔧 Old cars: It is preferable to change the oil after 5,000 km or every 3 months if the car is operated in harsh conditions.
🔧 Heavy use: If you drive in harsh conditions such as driving in traffic, on rough roads, or in high temperatures, the oil should be changed more frequently to avoid engine damage.
💡 Golden tip: Always check your car's owner's manual to find out the appropriate type of oil and the recommended change intervals.
Conclusion
Changing the engine oil periodically and choosing the appropriate viscosity is essential to maintaining the engine's life and optimal performance. If you drive a car that has exceeded 200,000 km, it may be better to switch to a higher viscosity oil such as 20W-50, especially in hot weather.
🚗 Always remember:
✔ Use the right oil according to the driving conditions and temperatures.
✔ Watch for signs of oil expiration to avoid any potential damage to the engine.
✔ Follow the manufacturer's recommendations to ensure the best engine performance.
If you are unsure about the right oil for your car, you can visit the nearest authorized service center or contact your car dealer for the right advice. 🛠🔧