DELTA PLUS TURBO EICHER OIL 15W40 CI-4 PLUS

It seems like you're mentioning a brand of diesel engine oil and a specific product within that brand. "Eicher Oil 15W40 CI-4 Plus" is a type of diesel engine oil, and "Delta Plus Turbo" appears to be a specific product under that brand. Diesel engine oils like these are designed to provide lubrication and protection for diesel engines.

The "15W40" in the product name refers to the viscosity grade of the oil. Viscosity is a measure of how thick or thin a fluid is. The numbers "15" and "40" in "15W40" represent the oil's viscosity at different temperatures. The "W" stands for "winter," indicating the oil's performance in cold temperatures. Lower numbers indicate better flow at lower temperatures (cold start), while higher numbers indicate better viscosity at higher temperatures (operating temperature).

The "CI-4 Plus" designation refers to a specification set by the American Petroleum Institute (API) for diesel engine oils. It is an older specification that indicates the oil meets certain requirements for use in high-speed, four-stroke diesel engines.

"Eicher" likely refers to Eicher Motors, an Indian automaker that specializes in commercial vehicles and is known for its trucks and buses. It's possible that Eicher Motors has its own brand of diesel engine oils, like the "Eicher Oil 15W40 CI-4 Plus" you mentioned.

"Delta Plus Turbo" is likely a specific variant or product within the Eicher Oil range, possibly formulated for specific applications or performance characteristics.

When selecting diesel engine oil for your vehicle, it's important to follow the manufacturer's recommendations and specifications to ensure optimal engine performance, protection, and longevity. Different engines and applications may require different types of oil, so it's a good idea to consult your vehicle's owner's manual or a trusted mechanic for guidance on choosing the right diesel engine oil.