dior crystal ring|dior ring used Yes. DOT 3 brake fluid is compatible with DOT 4 brake fluid. However, DOT 4 offers a higher boiling point. DOT 5.1 is used in high-performance and heavy-duty applications due to its high boiling point. It’s compatible with DOT 3 and DOT 4 fluid. DOT 5 brake fluid is silicone, meaning it doesn’t absorb water. Subscribe