15W40 Vs 15W50: Which Is Best?

15w40 and 15w50 are two different types of motor oil that are commonly used in vehicles. Both oils have similar viscosity levels, but some key differences make one better suited for certain types of engines and driving conditions.


15w40 oil is a multi-grade oil that is commonly used in diesel engines. It is a thicker oil that can withstand the high temperatures and heavy loads that are typically found in diesel engines. It is also commonly used in older vehicles and in vehicles that are driven in areas with high temperatures.


On the other hand, 15w50 oil is a high-performance oil that is commonly used in high-performance engines, such as those found in sports cars and racing vehicles. It is a thinner oil that can flow more easily through the engine, which can help to improve its performance. However, it may not be suitable for use in older or high-mileage engines, as it is not as protective as a thicker oil.

When choosing between 15w40 and 15w50 oil, it is important to consider the type of vehicle you have and the driving conditions you typically encounter. If you have a diesel engine or drive in hot climates, 15w40 oil may be the better choice. However, if you have a high-performance engine or want to improve your vehicle’s performance, 15w50 oil may be the better option.

Rubia TIR 7400 15W40:

Rubia TIR 7400 15W40 is a high-performance diesel engine oil manufactured by Total Lubricants. It is designed to provide superior protection and performance in heavy-duty diesel engines operating under severe conditions. This oil is formulated with a unique combination of base oils and advanced additives that provide excellent wear protection, high-temperature stability, and superior detergency. Additionally, it is designed to provide maximum fuel economy and reduce emissions, making it an environmentally friendly choice for heavy-duty diesel engines. Rubia TIR 7400 15W40 meets or exceeds the latest industry standards and is recommended for use in a wide range of diesel engines, including those used in construction, mining, and transportation applications.

To make the most of your oil change, it’s always best to consult your vehicle’s owner manual or consult with a professional mechanic, to determine which type of oil is best suited for your specific vehicle and driving conditions.


15w40 and 15w50 are both suitable for use in vehicles, but they have different characteristics and are better suited for different types of engines and driving conditions. It’s essential to take into account the type of vehicle, you’re driving c






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