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Decent, but it's tough on the environment.
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Prices may varyThis product ranks #5 of 14 in Brake Fluid.Three above it ↓
Last reviewed July 7, 2026
TL;DR Meets DOT 4 (FMVSS 116 minimum 446°F dry / 311°F wet); the SDS documents a 519.8°F dry boiling point, +73.8°F above minimum, while the 365°F wet figure is manufacturer-claimed, not independently tested. Not compatible with DOT 5 silicone systems, and it carries a California Prop 65 warning.
The Bosch ESI6 is labeled DOT 4, requiring a 446°F minimum dry boiling point and 311°F minimum wet boiling point under FMVSS 116. The SDS documents a fresh dry boiling point of 519.8°F, well above that floor. Brake fluid absorbs moisture over time, lowering heat resistance; the manufacturer claims a 365°F wet boiling point after moisture absorption, +54°F above minimum, though that figure comes from the product listing rather than a published test document. The formula also clears the DOT 3 and DOT 5.1 boiling-point requirements, and ABS, ESC, and traction control compatibility is confirmed on the label.
The ESI6 suits daily drivers where DOT 4 is the OEM spec; its documented dry boiling point beats commodity DOT 4 fluids clustered near the 446°F floor, and Bosch's OEM heritage is backed by a large, highly rated owner base on Amazon. Skip it if your vehicle requires DOT 5: the ESI6 is glycol-ether based and incompatible with DOT 5 silicone systems. Track use needing verified boiling points above 500°F dry is better served by a dedicated DOT 5.1 product.
The SDS signal word is WARNING. H361 classifies the product as a suspected reproductive toxicant (Category 2), and H373 flags possible kidney damage from prolonged or repeated exposure. SDS Section 8 specifies safety glasses and chemical-resistant gloves; splash risk during pressure bleeding and overhead caliper work makes eye protection worthwhile, and standard garage ventilation is adequate for normal service. The sweet taste of brake fluid attracts pets and children, so store it sealed and out of reach. It also carries a California Prop 65 warning (label and SDS Section 15). Spent fluid cannot go down a household drain; collect it during a flush and take it to a used-fluid collection facility.
The ESI6 is labeled and sold as a DOT 4 product. It is engineered to simultaneously clear the boiling-point minimums for DOT 3, DOT 4, and DOT 5.1, but it carries a DOT 4 label certification, not a DOT 5.1 label. For applications specifying DOT 5.1 by label, confirm with your vehicle OEM whether a DOT 4 fluid that meets DOT 5.1 boiling points is acceptable as a substitute.
Yes. DOT 4 fluids are backward-compatible with DOT 3 systems. The ESI6 is explicitly marketed as compatible with vehicles requiring DOT 3, DOT 4, or DOT 5.1. Always check your vehicle owner's manual for the recommended spec before adding or replacing fluid.
Yes. The product label explicitly confirms compatibility with ABS (anti-lock braking), ESC (electronic stability control), and traction control systems. This is expected for all glycol-ether DOT 3/4/5.1 fluids; DOT 5 silicone-based fluid is the type that is incompatible with ABS/ESC systems.
No. DOT 5 is a silicone-based fluid that is physically and chemically incompatible with glycol-ether fluids like the ESI6. The product label explicitly marks DOT 5 as incompatible with a red X. Mixing the two fluids damages seals and degrades braking performance. If your vehicle specifies DOT 5, use only DOT 5 silicone fluid.
Yes. The product carries a California Prop 65 warning. This is disclosed on the product label and SDS §15.
Marketing copy from Bosch, via Amazon. Not editorial.
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