Think of hydraulic oil as the blood of an industrial system. It transfers energy, dissipates heat, and removes waste. When it works well, everything runs smoothly. When it does not, the consequences show up where it hurts most - in downtime, in repairs, and in lost productivity.

The challenge is that hydraulic inefficiency rarely announces itself. It builds quietly, compounds gradually, and by the time it is visible, the damage is already done. Here is what is actually happening inside your hydraulic system, and what you can do about it.

The Efficiency Problem Nobody Talks About

A typical hydraulic pump is only 80 to 90% efficient. The rest is lost - either through mechanical losses caused by fluid friction, or volumetric losses from internal fluid leakage. These two forces pull in opposite directions: too high a viscosity and mechanical losses climb; too low a viscosity and volumetric losses take over. Finding the balance is not simple, and as system pressure rises, so does the efficiency gap.

The result? Equipment working harder than it needs to, consuming more energy, and wearing out faster.

Three Ways Contamination Is Quietly Destroying Your System

Data from 49,000 oil samples tested by the Mobil™ Lubricant Analysis lab reveals that 90% of machinery failures are linked to lubrication issues, and contamination is the single biggest contributor. It comes in three forms, each one damaging in its own way:

• Water ingress: Just 1,000 ppm (0.10 per cent)(a) of water in oil is enough to reduce bearing life expectancy. Rust, corrosion, and additive degradation follow
• Hard particulates: Hydraulic systems operate at clearances as small as 0.5 microns(b). A single dirt particle larger than that can cause scoring, excessive friction, and system breakdown
• Varnish: If hydraulic oil is the blood, varnish is the cholesterol. A hard, lacquer-like deposit that builds up silently on metal surfaces — once it reaches a valve, it causes flow obstruction and impairs heat transfer, leading to poor heating and cooling performance that can eventually compromise the entire system Varnish is difficult to remove using standard filtration techniques and typically requires specialized filtration technologies, chemical cleaning, or mechanical removal.

Four Rules for Keeping Hydraulic Systems Healthy

Good hydraulic maintenance comes down to four non-negotiables:

• Control the temperature: Too hot causes oxidation and varnish. Too cold causes pump cavitation. The right hydraulic oil grade makes all the difference
• Start clean: Even new systems can be contaminated. Clean before first use — always
• Stay clean: Store fluid properly, use dedicated clean containers, and filter the total oil volume through while in service
• Monitor the oil: Do not wait for something to go wrong. A regular oil analysis programme provides early warnings of mechanical problems and can extend drain intervals significantly

The right fluid changes the numbers

This is where fluid selection moves from a maintenance decision to a business one.

In controlled laboratory efficiency testing, Mobil DTE 10 Excel™ Series was measured to provide up to a 6 per cent improvement in hydraulic pump efficiency compared to Mobil standard hydraulic fluids(c). In a real-world excavator demonstration, this translated to 6 per cent less fuel per cycle and up to 5 per cent less time per cycle, amounting to up to 900 gallons of fuel saved and up to 9 metric tons of CO2 reduced over a full year of operation.*

Beyond efficiency, Mobil DTE 10 Excel™ Series outlasted standard hydraulic fluids by up to three times based on Mobil Hydraulic Fluid Durability testing, maintaining outstanding system cleanliness and component protection across temperatures as low as -34°C.

For operations where seal integrity is critical, Mobil DTE 20™ Ultra Series brings carefully balanced seal compatibility properties, protecting both older and modern high-pressure hydraulic systems - reducing leakage, contaminant ingress, and oil loss to the environment.

The right hydraulic fluid does not just protect the system. It pays for itself.

Fill with Mobil™. Fill with Confidence.

For more information, visit www.mobil.in/business

*Demonstration used a medium-sized excavator with a single operator and batch of fuel. Results may vary depending on operating conditions. (a) Reference: Machine design, How dirt and water effect bearing life by Timken bearing co.

(b) Disclaimer – Values mentioned in the documents are based on controlled tests and representative. For precise data, please consult your equipment manual or OEM.

(c) The energy efficiency of Mobil DTE 10 Excel™ relates solely to the fluid performance when compared to conventional Mobil-branded hydraulic fluids. The technology used allows up to 6 percent increase in hydraulic pump efficiency compared to Mobil DTE™ 20 series when tested in standard hydraulic applications under controlled conditions. The energy efficiency claim for this product is based on test results on the use of the fluid conducted in accordance with all applicable industry standards and protocols. Results may vary based on operating conditions and equipment.

Exxon Mobil Corporation has numerous affiliates, many with names that include ExxonMobil, Exxon, Esso, and Mobil. For convenience and simplicity, those terms, and references to "corporation," "company," "ExxonMobil," "EM," and other similar terms are used for convenience and may refer to one or more specific affiliates or affiliate groups.

For more information, visit www.mobil.in/business