EXPRESS TURBO TRACTOR OIL 15W40 API CH-4

It seems like you're referring to a type of diesel engine oil (DEO) with the specifications "TRACTOR OIL 15W40 API CH-4" under the brand name "EXPRESS TURBO." Let me break down the information for you:

Tractor Oil 15W40: The "15W40" refers to the viscosity grade of the oil. It indicates how the oil will perform under different temperature conditions. The "15W" part suggests that the oil has good flow characteristics at low temperatures (W stands for winter), and the "40" indicates its viscosity at higher operating temperatures. This viscosity grade is commonly used in diesel engines, including those found in tractors and other heavy-duty equipment.
API CH-4: The "API" stands for the American Petroleum Institute, which sets standards for engine oils. The "CH-4" is a specification level within the API classification system. It signifies that the oil is formulated to meet certain performance requirements for diesel engines, including those equipped with turbochargers. CH-4 oils typically offer improved control over soot-related issues, such as wear and deposits, and are designed for use in high-speed, four-stroke diesel engines.
Brand - EXPRESS TURBO: "EXPRESS TURBO" is the brand name of the diesel engine oil. Different brands may have their own unique formulations and additives, which can affect the oil's performance and characteristics.
Overall, the combination of "TRACTOR OIL 15W40 API CH-4" suggests that this diesel engine oil is designed for use in tractors and other heavy-duty machinery with diesel engines. It has a viscosity grade suitable for various temperature conditions and meets the API CH-4 specifications for performance in high-speed, turbocharged diesel engines. If you're considering using this oil, it's important to follow the manufacturer's recommendations and guidelines for your specific equipment.