DOT 4 vs. DOT 5.1: Choosing Brake Fluid for a European Car
Start with the vehicle’s specified fluid, then compare the product’s exact formulation, viscosity class and package size.
By Lee Shahin ·
ATE
ATE SL.6 DOT 4 low-viscosity brake fluid, 1 liter
Part or kit number: 03.9901-6402.2
ATE SL.6 low-viscosity DOT 4 brake fluid in a single one-liter container. This is SL.6, not Typ 200 or Super DOT 5.1. Confirm the required brake-fluid specification and vehicle configuration with the retailer before ordering.
Fitment and identification
For vehicles requiring the applicable DOT4 low-viscosity specification; ECS lists selected Audi, BMW, Volkswagen and MINI applications. Confirm exact fluid requirement with retailer; no universal fitment, service quantity or interval asserted.
Identity reviewed 9/22/2026.
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