Which statement accurately reflects the policy on oil mixing?

Which statement accurately reflects the policy on oil mixing?

• A. Mixing of different types of oils is prohibited
• B. Mixing of different types of oils is permitted
• C. Mixing is not recommended
• D. Mixing is required in some cases

Answer: (A)

Oil compatibility is crucial for reliable engine lubrication. Engines are specified to use a particular oil type and viscosity, and different oils have distinct additive packages and behaviors. Mixing oils can unpredictably change viscosity, disturb additive chemistry, and compromise the oil film that protects moving parts, increasing wear or causing deposits. Because of these risks, the policy prohibits mixing different types of oils. Statements that say mixing is permitted, not recommended, or required in some cases don’t align with maintaining the single, specified oil formulation and could lead to lubrication problems.

Oil compatibility is crucial for reliable engine lubrication. Engines are specified to use a particular oil type and viscosity, and different oils have distinct additive packages and behaviors. Mixing oils can unpredictably change viscosity, disturb additive chemistry, and compromise the oil film that protects moving parts, increasing wear or causing deposits. Because of these risks, the policy prohibits mixing different types of oils. Statements that say mixing is permitted, not recommended, or required in some cases don’t align with maintaining the single, specified oil formulation and could lead to lubrication problems.