Fleet Maintenance & Operations

The Road to Efficiency: How Low Viscosity Engine Oils Can Transform Your Fleet

For fleet owners and operators, every decision made about maintenance, fuel, and equipment has a direct impact on the bottom line. In an industry where margins are tight and uptime is everything, finding ways to improve efficiency and reduce costs is a constant challenge. But what if one simple switch could make a significant difference?

Enter low viscosity engine oils.

In a recent discussion, Karin Haumann, OEM Technical Manager for Shell Rotella, sat down with Heather Duffey, Global Integrated Marketing Communications Manager for Shell Global Lubricants, to shed light on the growing adoption of low viscosity engine oils and why they’re becoming the preferred choice for fleets looking to optimize performance​.

A Growing Trend with Big Benefits

For years, many fleets have relied on higher viscosity oils like 15W-40, believing that their thickness provided better engine protection. However, as technology advances and engines become more efficient, the industry is seeing a shift. More fleets are turning to 10W-30 synthetic blends and full synthetic oils, such as Shell Rotella® T5 10W-30 Synthetic Blend and Shell Rotella® T6 10W-30 Full Synthetic because they deliver the same level of protection—if not better—while offering a host of additional benefits​.

But for those who haven’t yet made the switch, what’s the real impact?

1. Fuel Economy That Adds Up

Fuel is one of the largest expenses for any fleet. When every drop counts, even a small increase in fuel efficiency can translate into significant annual savings. According to Haumann, low viscosity engine oils reduce resistance inside the engine, allowing oil to flow more easily and requiring less power to pump it.

“Fleets can expect to see up to a 2% improvement in fuel economy compared to a higher viscosity 15W-40 oil,”[1]Haumann explained​.

That may not sound like much at first, but consider this:

• If a single truck consumes 20,000 gallons of fuel per year, a 2% savings equals 400 gallons saved annually.
• Multiply that by a fleet of 100 trucks, and you’re looking at 40,000 gallons saved every year.
• With diesel prices fluctuating, those savings could mean tens of thousands of dollars back in your pocket—just from changing your engine oil.

2. Engine Protection That Lasts Longer

A common concern among fleet operators is whether thinner oil can still provide adequate engine protection. The good news? Synthetic low viscosity oils don’t just match the protection of conventional oils—they often exceed it.

Haumann explained that synthetic oils have a higher viscosity index, meaning they maintain a more stable thickness across temperature changes. In practical terms, this means:

• Better flow in cold temperatures, reducing wear on startup.
• Greater heat tolerance, preventing breakdown under extreme operating conditions.
• Consistent lubrication, ensuring critical engine parts stay protected no matter the season​.

3. Lower Maintenance Costs & Extended Drain Intervals

Beyond fuel efficiency and protection, fleets also need to think about operating costs. Every oil change takes a truck off the road, cutting into revenue and productivity.

By using Shell Rotella’s synthetic and synthetic blend oils, fleets can benefit from:

• Improved resistance to oxidation – The oil stays in better condition for longer.
• Extended drain intervals – Fewer oil changes mean reduced downtime and lower labor costs.
• Less wear and tear on the engine, leading to fewer mechanical issues and breakdowns​.

“In the long run, it’s not just about saving money on oil changes,” said Haumann. “It’s about protecting your engine, reducing repairs, and keeping your trucks on the road where they belong.”

Making the Switch is Easier Than You Think

Some fleet managers hesitate to switch engine oils, fearing compatibility issues or costly adjustments. However, Haumann assured that transitioning to a lower viscosity oil is simple and requires no major engine modifications.

“The 10W-30 options, like Shell Rotella T5 and T6, are excellent choices for fleets looking for an immediate impact on their total cost of ownership,” she emphasized​.

The Bottom Line: It’s Time to Make the Change

If your fleet hasn’t yet explored the benefits of low viscosity engine oils, now is the time. With a simple switch to Shell Rotella T5 10W-30 Synthetic Blend or Shell Rotella T6 10W-30 Full Synthetic, more efficiency, lower costs, and better protection are within reach.

_{^[1] Shell Rotella T5 10W-30 Synthetic Blend provides fuel economy savings up to 2% compared to a conventional 15W-40.}

On this podcast episode of Trucking Business and Beyond, Karin Haumann, OEM Technical Manager for Shell Rotella, explores the essential role of engine lubricants. With over 12 years of expertise, Karin simplifies the complexities of engine oils, from the differences between synthetic and conventional options to the innovative technologies behind Shell Rotella's lineup. Fleet owners and operators will discover tips on selecting the right oil for various climates, boosting fuel efficiency, and preparing for the evolving landscape of engine lubrication, including the rise of electric vehicles. A must-listen for anyone invested in vehicle maintenance!