Bleedkit.com GOLD Mineral Oil 500ml

Five hundred millilitres of Gold mineral oil is the bulk-size refill for the mineral-oil side of the workshop drawer. Gold is Bleedkit.com's own brake-fluid formulation, sized for the mineral-system catalog: Shimano hydraulic, Magura MT, Tektro and TRP, Formula Cura. The 500 ml bottle covers several full bleeds per brake and a long bench-life if stored sealed; the bulk size that a multi-bike workshop reaches for when a 100 ml bottle won't last a weekend.

Features

• High initial boiling point at 360°C / 680°F, well above DOT 5.1's 260°C / 500°F floor
• Viscosity index 200, holding lever-feel consistency from cold-weather workshop bleeds through summer bike-park dosages
• Made from renewable resources and biodegradable to OECD 301B; classified as non-water-pollutant
• Non-hazardous good per transport regulations, which keeps it shippable through normal North American couriers
• Sized for the bleed-bench drawer: 500 ml bottle, sealed cap

Compatibility

The fluid suits every brake designed for mineral oil: Shimano (XTR, XT, Saint, Zee, SLX, Deore, Alivio, Acera, Alfine, Metrea, plus drop-bar Dura-Ace / Ultegra / 105 / GRX / Tiagra and the 2026 R9300 / R8270 generation), Magura's MT family (running Royal Blood compatible), Tektro and TRP, and Formula Cura. It is not compatible with DOT brakes: SRAM Code / Level / Guide / G2 / Force AXS / Red AXS, Avid Elixir / Juicy, the older DOT-based Formula family (Oro, C1, R1, R0, K24, K18), or Hayes and Hope DOT systems. The DOT-versus-mineral split is the bench safety boundary, not just a preference: a syringe that has touched DOT cannot then touch a mineral system without attacking the seal stack.

Specs

• Volume: 500 ml
• Initial boiling point: 360°C / 680°F
• Viscosity index: 200
• Biodegradable: OECD 301B
• Made by Bleedkit.com (Ljubljana, Slovenia)

Includes: one 500 ml sealed bottle of Bleedkit.com Gold mineral oil.

From Ljubljana, since 2011

Bleedkit.com builds per-brake-system kits and per-system fluids in Ljubljana, Slovenia and has done so since 2011; distribution through Euro Toolworks is the same path that brings Unior cycling tools to the North American market. Unior has been forging hand tools in Zreče since 1919, and is the official technical partner of multiple World Tour and downhill teams. The 500 ml Gold bottle is the bulk-pack refill for the kits in the mineral-oil drawer; the same formulation ships at 100 ml inside the Formula Cura and Magura kits, sized to a single brake's bleed cycle.

Pro tip from our mechanics

Storage matters more for mineral oil than most home mechanics expect. The fluid itself does not absorb water the way DOT does, but it does pick up dust and aerosol contamination from the bench environment. Keep the bottle sealed when not actively drawing fluid, and decant into a syringe rather than pouring directly from the bottle onto an open funnel; the bottle's sealed cap is the first defence against contamination, and the syringe path keeps the open-air exposure short. A 500 ml bottle stored sealed will hold its quality across a season of weekend bleeds.

Whether the 500 ml Gold bottle is sized right for your shop or whether the 100 ml in the per-brake kits is enough is laid out in our compatibility guide: Which bleed kit fits Shimano R9300, Ultegra R8270, and SRAM Maven Bronze →