Phillips 66 Guardol ECT 10W-30 Heavy Duty Motor Oil with Patented Liquid Titanium

As diesel fuel costs continue to be a significant cost in transportation today, there are ways to help reduce fuel costs by increasing fuel efficiencies. Reducing idle time and proper tire inflation are areas we all know that can reduce fuel usage. There are also product options available today that can have a significant impact on fuel usage.

Change not only your oil, change your oil viscosity. Industry tests have shown that changing from a CJ-4 15W-40 to a CJ-4 10W-30 diesel engine oil can increase fuel economy by 1% or more. By utilizing synthetic lubricants in transmission, differential and axles as well you can expect to see a 2-4% fuel savings when matched with fuel saving engine oil.

Phillips 66 Guardol ECT 10W-30 with patented Liquid Titanium® additive combines fuel economy with wear protection to keep your business rolling.

For more information on this and all of our Top Tier lubricating products, please contact one of our customer service team members, or call 888.810.3835.


The Heavy Duty 10W-30 Fuel Economy Story

Although heavy duty 10W-30 engine oils have historically made up less than 6% of the HDEO market, there is a lot of attention being paid to them recently. The main driver for interest in these products is the expected fuel economy savings versus the use of an equivalent 15W-40 product. Indeed, over the last year, many of the major engine builders have adopted 10W-30 products as their factory-fill oil leading to more mainstream visibility and desirability.

When considering fuel economy and engine oil, it all boils down to viscosity and especially high temperature / high shear (HTHS). The minimum HTHS for a CJ-4 qualified HDEO (either 15W-40 or 10W-30) is 3.5 centipoise (cP). A typical 15W-40 has a HTHS in the range of 4.4 – 4.6 cP while an equivalent 10W-30 has a typical HTHS between 3.5 – 3.7 cP. This difference in HTHS is generally expected to relate to between 0.5 – 1.0% fuel economy savings. For instance, the use of a 5W-40 full synthetic product versus a 15W-40 should equate to ~ 0.5% savings since its HTHS is much closer to that of a 15W-40.

Note: The upcoming new category (PC-11) is expected to focus heavily on fuel economy and engine protection when using lower viscosity lubes. We are likely to see two 10W-30 grades, one which will be similar to current blends and another considered “fuel economy” which may have a HTHS as low as 2.9 cP. The current 10W-30’s will not give the improvements that are needed for the new category.

More Than Just the Crankcase:

When considered holistically, the inclusion of full synthetic transmission, differential and axle lubricants with a fuel economy HD engine oil can add up to even more savings in the range of 2 – 4%. A comprehensive lubricants program along with other fleet initiatives such as reduced idling time, the use of low rolling-resistance tires and aerodynamic modifications to cabs and trailers can make a substantial difference to fleets.


Lubricants purchases make up only about 1% of a typical fleets budget but they can have a big impact on other costs. This is clearly a case where properly matching the goals of the fleet operator with the correct mix of lubricants can incur a slight increase in the cost of their lubricants but may result in a significantly larger overall decrease in total costs for the fleet. In other words, you can spend a little more to save a lot more!

In cold climates, operators may claim savings simply based on the fact that the lower viscosity oil flows better at low temperatures and gets up to operating temperature faster than higher viscosity oil. This ease of starting saves wear and tear on batteries and other starter system components and can minimize or eliminate the need for extension cords and extensive use of block heaters. Along with the use of full synthetics in the transmission and axles, viscous drag is much less during initial warm up in cold weather, yielding fuel savings due to reduced idling / warm up time.


While some competitors are content to leave customers with the impression that only their formulations will allow for fuel economy savings, the truth is much simpler. When switching from a 15W-40 to a HD 10W-30, fuel economy savings of up to 1% are simply the result of the difference in viscosity and HTHS. Once a customer has expressed a desire for using lubricants to help achieve their fuel economy goals, the natural next step is to discuss durability.


The cost of a new truck is not cheap and anyone who owns equipment with an intent to keep it as long as possible understands intuitively that the longer an asset is working for them without the need for major repairs or replacement, the more valuable that asset is. The idea of the 1,000,000 mile overhaul is not new, and many well-maintained modern engines are able to exceed that traditional target.

Selecting a 10W-30 for use in heavy duty applications leads naturally to a discussion about maintaining the same drain intervals and adhering to the same maintenance goals overall.
After all, you’ve now got a lighter viscosity, thinner oil film in the same application running the routes year-round. Will it perform as well?

That’s where our extensive testing with Liquid Titanium® comes in. Its impact is real and customers can be assured that the same outstanding wear protection they expect from our premium 15W-40 is the same protection they can expect from our premium 10W-30. Our exclusive Liquid Titanium protection additive works at a molecular level, chemically bonding to critical engine parts to reduce wear helping to extend engine life.

• In on-highway trials exceeding 7.95 million miles across engine platforms, vehicle types, conditions and service, oil with Liquid Titanium reduced relative iron concentrations in used oil—a key indicator of engine wear—by up to 31% (and an average of 23% across all platforms)

• In off-highway trials exceeding 250,000 hours across varying engine platforms, vehicle types, conditions and service, oil with Liquid Titanium reduced relative iron concentrations in used oil by an average of 18% across all platforms


The bottom line is that the wear protection you get from our premium 15W-40 is the very same protection you can expect from our premium 10W-30 engine oil! When discussing this trending topic with your fleet prospects, remember that fuel economy is the start of the discussion, not the end. Understanding the goals of the fleet manager will help to reinforce that the financial and operational goals which can be achieved by converting to a HD 10W-30 must be balanced by the need for durability and equipment longevity. All of those needs and more can be met through the combination of Phillips 66 Lubricants’ excellent products and the outstanding service that our Marketers provide.

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