Marine Hydraulic Oils — Deck Machinery & Steering Systems

Key Specifications

Technical Detail

Viscosity-grade selection

Grade is chosen for the operating temperature and pump type. ISO VG 46 is the common all-round marine grade; VG 32 suits colder duty and VG 68 warmer engine-room service. Multigrade and high-VI oils widen the usable temperature range for deck systems exposed to weather.

Anti-wear chemistry and cleanliness

Zinc (ZDDP) anti-wear oils protect vane and piston pumps; ashless (zinc-free) oils are used where filterability and water tolerance matter. System cleanliness to an ISO 4406 target is critical — most hydraulic failures trace back to particulate contamination and water rather than the oil itself.

Biodegradable options for oil-to-sea risk

Deck equipment that can leak overboard — cranes, steering gear on some vessels — may require Environmentally Acceptable Lubricants (EALs) under the US EPA Vessel General Permit. Saturated-ester hydraulic EALs meet these requirements while retaining anti-wear performance.

Ports Where We Supply Marine Hydraulic Oil

Seven Ocean procures and delivers Marine Hydraulic Oil alongside bunker fuel at every major bunkering hub worldwide and across all 25 Indian ports — matched to your engine maker's approvals. Select a port for its full bunkering guide.

International Hubs

Indian Ports

Frequently Asked Questions

Which ISO VG do I need?

Follow the equipment maker's recommendation and your operating temperature. VG 46 is the most common marine hydraulic grade; VG 32 for cold climates, VG 68 for warmer, higher-load service.

Zinc or ashless hydraulic oil?

Zinc anti-wear oils are the standard workhorse; ashless oils are chosen where water separation, filterability or environmental compatibility is a priority. We'll advise based on your pumps and duty.

Do you supply EAL hydraulic oils for VGP compliance?

Yes. We supply biodegradable ester-based hydraulic EALs for stern-tube, thruster and deck systems that fall under the oil-to-sea interface rules.