Hydraulic Oils Selection Guide UAE: ISO VG Grades, Specs, and Buyer’s Checklist
Why ISO VG grade is the first decision — and most UAE buyers get it wrong
Hydraulic oil is sold by ISO VG (Viscosity Grade) number — AW 32, AW 46, AW 68, AW 100, AW 150 — and that number equals the oil’s kinematic viscosity at 40°C in centistokes (cSt). The grade you need is determined by the pump manufacturer and the operating temperature, not by what your last supplier happened to deliver. A hydraulic system designed for AW 46 will run hot, lose efficiency, and accelerate wear if you refill with AW 32 ‘because it was on the shelf.’
In UAE conditions, where reservoir temperatures routinely hit 70-80°C under load, the rule of thumb is to go one VG grade higher than the OEM’s cold-climate recommendation. A Japanese excavator manufacturer recommending AW 32 for temperate climates will run cleanly on AW 46 in Dubai summer.
DANA hydraulic oil range — full VG spectrum
DANA Lubes has been blending AW-grade hydraulic oils in the UAE since 2002, with VG 32 through VG 150 in production. All grades are formulated with anti-wear (AW), anti-foam, rust inhibition, and oxidation stability packages tuned for sustained Gulf operation. Bulk delivery available for fleet operators; 200-litre drums and 20-litre pails for workshops.
| ISO VG | Viscosity @40°C (cSt) | Best For | Typical UAE Application |
|---|---|---|---|
| AW 32 | 32 | Light hydraulic systems, mobile equipment | Telescopic handlers, small presses |
| AW 46 | 46 | Most industrial hydraulics (default) | Excavators, injection moulding, machine tools |
| AW 68 | 68 | Higher-temperature systems, mobile hydraulics | Cranes, heavy excavators, marine hydraulics |
| AW 100 | 100 | Slow-moving heavy actuators | Presses, die-casting, large hydraulic cylinders |
| AW 150 | 150 | High-pressure slow-speed systems | Steel mills, heavy marine hydraulics |
Three hydraulic oil mistakes that cost UAE workshops real money
- Mixing zinc-based and ashless (ZF) hydraulic oils in the same system — the additives react and drop out as sludge, choking servo valves.
- Topping up AW 46 with whatever’s on the shelf instead of matching grade — viscosity drift destroys pump efficiency.
- Skipping particulate filters in dusty environments — ISO 4406 cleanliness matters more in UAE than in temperate climates.
How to read your hydraulic system’s actual oil consumption
A well-sealed hydraulic system shouldn’t consume oil. If you’re adding 5+ litres per month to a 200-litre reservoir, you have a leak — usually a rod seal on a cylinder or a pump shaft seal. Don’t compensate by topping up; find the leak. Hydraulic oil in the soil is an environmental incident; hydraulic oil on the workshop floor is a slip hazard.
DANA’s bulk delivery and on-site technical support include viscosity sampling — bring a 100ml sample from the reservoir and we’ll run a free ISO VG check and contamination screen.
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Frequently Asked Questions
What ISO VG hydraulic oil do I need?
The ISO VG grade is determined by the pump manufacturer — typically AW 32 for light systems, AW 46 for most industrial hydraulics, AW 68 for higher-temperature or mobile hydraulics, AW 100 for slow-moving heavy actuators, and AW 150 for high-pressure slow-speed systems. In UAE summer heat, go one VG grade higher than the OEM’s temperate-climate recommendation. DANA Lubes stocks the full AW 32 through AW 150 range.
Can I mix hydraulic oils from different brands?
Generally no — hydraulic oils from different manufacturers may use incompatible additive packages, especially zinc-based (traditional) vs ashless (ZF) chemistries. Mixing causes additive dropout, sludge formation, and servo-valve sticking. If a top-up is required and the original oil brand is unknown, drain and refill rather than risk a contaminated system.
How often should I change hydraulic oil?
Standard recommendation is every 2,000-4,000 operating hours, or sooner if ISO 4406 particulate counts exceed 18/16/13. UAE conditions (heat, dust) typically shorten the interval by 20-30%. Always check the OEM’s service schedule — some modern hydraulic systems specify 6,000+ hour drains with appropriate filtration.
What’s the difference between AW 32 and AW 46 hydraulic oil?
AW 32 has a kinematic viscosity of 32 cSt at 40°C; AW 46 has 46 cSt at 40°C. AW 46 is thicker and provides better film strength at higher temperatures but slightly higher internal pump friction. For UAE ambient temperatures above 40°C, AW 46 is typically a better match than AW 32, even when the OEM recommends AW 32 for cooler climates.
Is DANA hydraulic oil suitable for excavators?
Yes — DANA AW 46 and AW 68 hydraulic oils are formulated for mobile excavator hydraulics operating in Gulf conditions, with anti-wear additives meeting DIN 51524 Part 2 (HLP) and filterability per ISO 13357. Available in bulk road tanker, 200-litre drums, and 20-litre pails from the Sharjah warehouse.