Following the release of our new ULTRA-HYD brochure, we’re highlighting one of the range’s most advanced solutions: ULTRA-HYD ZF LL – our Zinc Free Long Life hydraulic fluid, meeting the stringent Bosch Rexroth RDE 90245 specification.
This approval positions ULTRA-HYD ZF LL as a leading solution for systems where high levels of reliability, fluid cleanliness, and long service life are essential. RDE 90245 is one of the most demanding hydraulic fluid benchmarks in the industry – and ULTRA-HYD ZF LL exceeds it.
The latest issue of Lube Magazine underscores the growing demand for environmentally responsible lubricants in modern operations, particularly zinc-free hydraulic fluids. These fluids are redefining performance benchmarks in terms of drain intervals, equipment longevity, and sludge control.
Introducing ULTRA-HYD ZF LL: The Next Generation of Zinc-Free Fluids
Part of Rock Oil’s commitment to environmentally conscious lubrication, ULTRA-HYD ZF LL combines zinc and ash-free additive technology with outstanding durability and performance. It delivers 1,500 hours in the A2F10 test – a severe hydraulic pump trial designed to simulate demanding real-world conditions.
For reference, the standard industry benchmark for this test is just 500 hours, equating to a 2,000-hour drain interval in field applications. ULTRA-HYD ZF LL triples this performance, extending service life and reducing maintenance burden.
Key Features & Benefits
- Now approved to Bosch Rexroth RDE 90245 – among the industry’s most demanding hydraulic fluid specifications
- Zinc and ash-free formulation – safe for the environment and compatible with sensitive metals
- Over 10,000-hour TOST life – double that of many conventional hydraulic fluids
- 1,500-hour A2F10 pump test result – supporting up to 2,000-hour real-world service intervals
- Up to 63% lower water acidity and 36% less sludge vs. other zinc-free alternatives
- Excellent wet and dry filterability, anti-foam, and de-aeration properties
- ISO Cleanliness rating of 21/19/16 or better
- Compatible with most seal materials, system designs, and mineral-based hydraulic oils
- Available in ISO Viscosity Grades 32, 46, and 68
Backed by the Rock Oil Industrial Division
Choosing the right fluid is only the beginning. Ensuring performance and ROI means ensuring changeovers, filtration, and monitoring are handled correctly – and that’s where the Rock Oil Industrial Division can add value. Our team works directly with OEMs, plant managers, and maintenance teams to:
- Plan efficient transitions from legacy fluids
- Optimise drain intervals and filtration systems
- Support energy savings through site-specific analysis
- Train teams and operators on best-practice fluid handling
With a dedicated technical support team, we provide hands-on guidance, fluid sampling, and fast response troubleshooting – helping you extract maximum value from ULTRA-HYD ZF LL from day one.
Lead the Change in Hydraulic Efficiency
As sustainability and efficiency become core performance indicators, ULTRA-HYD ZF LL redefines what’s possible. Fully compliant with Bosch Rexroth RDE 90245, and proven through rigorous testing, it’s the clear choice for high-performance hydraulic systems. Download our brochure here, or for product enquiries and technical guidance contact the Rock Oil Industrial Division today.