Correct hydraulic oil selection protects pumps and valves, keeps systems efficient, and reduces downtime. The United Kingdom has variable conditions from cold starts to long operating shifts. That makes viscosity choice, oxidation stability, and seal compatibility important. As the authorised UK distributor, Sinopec Online supplies genuine Sinopec hydraulic oils for plant, factory equipment, and mobile machinery. Open Hydraulic Oils from the main menu at Sinopeconline.com.
Choose the right viscosity grade
Hydraulic fluids are selected by ISO viscosity grade at 40 °C. In the UK, ISO VG 32 and ISO VG 46 are common all-round choices. The oil must be thin enough for cold start flow yet thick enough to maintain a protective film at operating temperature. The ISO 11158 specification defines mineral oil categories such as HM and HV that many manuals reference.
Know the standards and what they mean
- ISO 11158 defines baseline requirements for mineral hydraulic fluids for hydrostatic systems. It classifies HH, HL, HM, HV, and HG types.
- DIN 51524 adds detail for HLP and HVLP performance with anti-wear, corrosion, and oxidation control. HLP is the usual choice indoors. HVLP helps where temperature varies.
These standards appear in handbooks and oil data sheets. Match the machine sheet first, then choose the ISO grade.
Match the oil to duty and environment
For presses, injection moulding machines, and general plant, an HLP oil meeting DIN 51524-2 and ISO 11158 HM is often suitable. For outdoor lifting, telehandlers, or plant that faces wide ambient swings, an HVLP product gives better response at start-up and holds viscosity in heat. Confirm the manual before switching families.
Pump approvals and compatibility
Pumps set shear and anti-wear demands. Sinopec anti-wear hydraulic oils are formulated to meet major pump maker requirements such as Parker Denison HF-0 and Eaton Vickers where specified. Always check the manual and align the oil with the listed approvals.
Common errors to avoid
- Using one grade for every system. Clearances, duty, and temperature vary across machines.
- Mixing zinc and ashless chemistries without checking compatibility.
- Stretching intervals beyond guidance. Oxidation and varnish reduce response and increase wear.
Maintenance that saves money
- Keep breathers clean and use return-line filtration sized to the flow.
- Sample at steady operating temperature. Trend viscosity, TAN, and particle counts.
- Store sealed drums indoors. Allow temperature equalisation before transfer.
Where to buy
Order directly from the authorised UK distributor at Sinopeconline.com. Use the main menu to open Hydraulic Oils and select the grade for your machine.
References
- ISO 11158 Mineral Hydraulic Fluids
- DIN 51524-2 HLP and DIN 51524-3 HVLP
- Parker Denison pump guidance
Author: Sinopec Online Technical Team
Frequently asked questions
Which grade suits outdoor plant in winter
ISO VG 32 or an HVLP in the grade permitted by the manufacturer is a sensible start. Confirm in the manual.
Does HM or HV matter in a factory press
Indoors with stable temperature, HLP oils that meet DIN 51524-2 are often appropriate. Follow the machine sheet.
