Discussion
Which fluid must never be added to a glycol brake system?
Answer: D
Mineral oil swells and destroys the rubber seals throughout the system, requiring every component to be replaced. Mixing DOT grades of glycol fluid is acceptable. Silicone is a separate incompatibility but the classic and catastrophic error is mineral oil. Naming what changes and what stays the same is the reliable route through questions of this shape. The order in which the effects act is what decides the outcome, so it is worth establishing first.
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