{"product_id":"bosch-esi6-low-viscosity-extended-life-brake-fluid-1-qt-dot-3-4-5-1-high-wet-boiling","title":"Bosch ESI6 Low-Viscosity Extended-Life Brake Fluid, 1 Qt — DOT 3\/4\/5.1, High Wet-Boiling","description":"\u003cp\u003e\u003cstrong\u003eBosch ESI6 is a low-viscosity, extended-life brake fluid engineered to improve wet-boiling resistance and brake-system efficiency while remaining compatible with DOT 3, DOT 4 and DOT 5.1 systems.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eModern brake systems demand fluids that flow quickly through ABS modulators and maintain safety margins under heat. ESI6 was developed to meet those hybrid needs: a lower viscosity for faster hydraulic response combined with an elevated wet boiling point (365°F) to resist vapor lock. The result is a product intended as a direct replacement for most vehicles specifying DOT 3, DOT 4 or DOT 5.1, offering longer change intervals and improved lubricity to reduce component wear and noise.\u003c\/p\u003e\n\n\u003ch3\u003eHow does ESI6 affect braking response and ABS performance?\u003c\/h3\u003e\n\u003cp\u003eLower viscosity improves fluid circulation through tight passages and electronic control valves, making ABS and stability systems respond more quickly. Faster fluid flow helps maintain consistent pedal feel in cold and warm conditions, especially in vehicles with complex electronic braking modules.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e30% lower viscosity vs. many DOT 5.1 fluids for faster hydraulic action\u003c\/li\u003e\n  \u003cli\u003eImproved modulation in ABS and traction-control events\u003c\/li\u003e\n  \u003cli\u003eStable performance across a wide temperature range\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill switching to ESI6 extend how often I change brake fluid?\u003c\/h3\u003e\n\u003cp\u003eESI6 is formulated for extended service life compared with conventional fluids. It resists degradation and moisture-related boiling better than older formulations, which can allow longer intervals between full fluid changes when used correctly.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eDesigned to last about 100% longer than typical DOT 3 fluids\u003c\/li\u003e\n  \u003cli\u003eApproximately 50% longer service life than many DOT 4 products\u003c\/li\u003e\n  \u003cli\u003eAbout 10% longer than standard DOT 5.1 while offering lower viscosity\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eIs ESI6 compatible with my vehicle’s brake fluid?\u003c\/h3\u003e\n\u003cp\u003eESI6 is compatible as a top-off or replacement for systems that require DOT 3, DOT 4 or DOT 5.1. It mixes safely with those fluids; however, it must never be used in systems that specify silicone-based DOT 5 fluids.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eSafe to mix with DOT 3, DOT 4 and DOT 5.1 for topping up\u003c\/li\u003e\n  \u003cli\u003eOptimal results follow a complete fluid change rather than partial topping when feasible\u003c\/li\u003e\n  \u003cli\u003eDo not use in DOT 5 systems—DOT 5 is a silicone fluid and not compatible\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat should I know about installation and volume needs?\u003c\/h3\u003e\n\u003cp\u003eOne quart (32 ounces) is the typical retail package; many vehicles will require multiple quarts to fully flush and bleed a system. Proper bleeding is important to remove old, moisture-contaminated fluid and to realize the long-life benefits of ESI6.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003ePlan on more than one quart for a complete system flush on most cars\u003c\/li\u003e\n  \u003cli\u003eFollow manufacturer bleed procedures and safety precautions for brake service\u003c\/li\u003e\n  \u003cli\u003eObserve California Proposition 65 notice regarding chemical exposure\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: Bosch ESI6 is aimed at drivers and technicians who maintain modern braking systems—especially vehicles with ABS, ESP, or electronic brake controls—seeking improved hydraulic response, reduced component wear, and longer intervals between full fluid changes. It suits owners of cars and light trucks that specify DOT 3, DOT 4 or DOT 5.1; it is not appropriate for vehicles that require DOT 5 silicone fluid. If you perform a full fluid replacement, purchase sufficient quarts to completely flush the old fluid and follow recommended bleeding practices to ensure optimal performance.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can I mix Bosch ESI6 with my existing DOT 4 fluid?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. ESI6 is compatible with DOT 3, DOT 4 and DOT 5.1 fluids and can be used to top off, though a full fluid change yields best results.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Is Bosch ESI6 safe to use in DOT 5 brake systems?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: No. ESI6 is not compatible with DOT 5 silicone fluids; never replace DOT 5 with ESI6.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Bosch","offers":[{"title":"Default Title","offer_id":48087376724126,"sku":"B07338GQM8","price":34.98,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/bosch-esi6-front-quart-bottle.jpg?v=1785922370","url":"https:\/\/northtrailauto.ca\/products\/bosch-esi6-low-viscosity-extended-life-brake-fluid-1-qt-dot-3-4-5-1-high-wet-boiling","provider":"North Trail Auto","version":"1.0","type":"link"}