15W-40 CI-4 Oil Overview

“15W-40 CI-4” refers to a specific type of motor oil.

• 15W-40: This indicates the oil’s viscosity, which is its resistance to flow. In this case, the oil has a viscosity of 15 in cold temperatures (W stands for Winter) and 40 in high temperatures. This makes it a multi-viscosity oil suitable for a range of climates.
• CI-4: This is a specification that denotes the oil’s performance level, set by the American Petroleum Institute (API). CI-4 oils are designed for use in heavy-duty diesel engines, providing high-temperature stability, soot control, and protection against wear and deposits.

In summary, “15W-40 CI-4” is a motor oil suitable for various temperatures, meeting specific performance standards for heavy-duty diesel engines.

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