HM or HV hydraulic oil: how to check ISO VG 32, 46 and 68
Start with the equipment manual, then check the oil type, viscosity grade and operating conditions together. Use the product-specific TDS to assess a proposed oil; neither an HM/HV label nor a viscosity number alone confirms suitability.
1. Identify the equipment requirement
Record the equipment model, required lubricant specification and permitted viscosity grades. If the manual is unavailable, ask the equipment supplier for the requirement before choosing a replacement. Keep any required approval separate from a preferred brand.
2. Compare HM and HV against the actual conditions
In this catalogue, EILONG L-HM is listed for mobile and industrial hydraulic systems, while L-HV is listed for cold-region construction, oilfield and mining equipment. Treat these as application starting points, not equipment approvals or universal temperature limits.
Ambient and operating temperatures affect hydraulic-fluid viscosity. Ask for grade-specific data at the conditions relevant to your equipment rather than choosing by climate or product name alone.
3. Confirm the grade and supply details
For ISO VG 32, 46 or 68, confirm that the chosen grade is permitted by the equipment requirement. Then request its current TDS and SDS, specify packaging and quantity, and ask for compatibility guidance if replacing or topping up an existing oil.
4. Do not treat HM and HV as the same oil
A shared ISO VG grade only places the oils in the same viscosity band at 40°C. In this catalogue, EILONG L-HV is the cold-region listing and EILONG L-HM is the mobile and industrial anti-wear listing. TRIOSD L-HM is listed only as ISO VG 46, not as 32, 68 or HV.
Do not top up an existing fill, and do not switch between these listings, until the equipment manual and the current TDS for the quoted grade have been compared. CloudBridge can request those documents. The manufacturer named on the quotation confirms the specification.
Mobil: hydraulic oils — Technical reference: temperature and viscosity. This source does not certify or endorse the products listed here.
Questions about this topic
Can I replace HM 46 with HV 46 without checking?
No. Compare the equipment requirement and the specific product documents, and confirm compatibility before changing oils. A matching viscosity grade alone is not enough.
Can you specify a minimum starting temperature from the product name?
No. Request the current data for the exact grade and check it against the equipment requirements. This guide does not assign a universal operating-temperature range.
Catalogue grades in this guide were checked against the product listings on this website and the standards named above. CloudBridge coordinates the inquiry. The manufacturer named on the quotation confirms the current specification.
