AMSOIL has added a new 10W-30 diesel oil to their elite Signature Series Max-Duty line. The full-synthetic Signature Series Max-Duty 10W-30 meets the latest API CK-4 specifications along with a multitude of industry standards.
Why Did AMSOIL Add 10W-30 Diesel Oil To Their Product Line?
There is a trend toward lighter viscosity motor oils in class 8 semi-unit engines. Engines such as Paccar MX13, Volvo D11, D13, D16 and Cummins X15 and X12 are compatible with 10W-30 motor oil. This is an effort to optimize fuel-economy. The use of lighter viscosity oils means that the industry has to be more diligent about wear control. Signature Series Max-Duty offers a world-class formula that demolishes industry wear tests such as the Detroit Diesel D13 Scuffing Test.
Ideal Applications For AMSOIL Signature Series Max-Duty 10W-30
Signature Series Max-Duty 10W-30 is ideal for newer or older diesel engines requiring a 10W-30 engine oil. Semi-truck owner/operators who are trying to maximize engine life might find this product particularly appealing. Reduced friction, extended oil change life and maximum engine life are attributes that they will appreciate.
This new 10W-30 meets the latest industry standards including API CK-4.
This product is certainly not the cheapest 10W-30 diesel oil out there. But we believe that it is the best. For those looking to protect their investment and make their engine last as long as possible, this synthetic diesel oil could be the best value on the road. Check out the product page at the link above for all of the features as well as the suitable applications and specifications.
Where To Buy AMSOIL Signature Series Max-Duty 10W-30 Synthetic Diesel Oil
We can ship Signature Series Max-Duty 10W-30 from 13 warehouse across the US and Canada. We also offer free shipping on qualified orders. There are commercial wholesale accounts for owner/operators and personal-use wholesale options as well.
Contact us for a price list using the form on this page.
A reader asks: Will AMSOIL be coming out with a Signature Series 0W-16 oil anytime soon?
Our answer: It will almost certainly happen, but we wouldn’t expect it in the immediate future. For now, just the Honda Fit and certain Toyota Camry models take 0W-16 motor oil. So it goes without saying that the market for 0W-16 motor is currently very tiny. As of now, AMSOIL offers the value-packed OE 0W-16 Synthetic Motor Oil.
We expect that many more automakers will start to suggest 0W-16 for some models in the next few years. This would likely prompt AMSOIL to expand the 0W-16 offerings to the higher-end Signature Series and XL Series.
If auto manufacturers make a significant move to 0W-16 motor oil in 2021-22 (and that is plausible), it would expand the 0W-16 market overnight. But again, until more engines are designed for 0W-16 motor oil, we would expect that AMSOIL will offer only the OE Series version.
AMSOIL has reformulated their flagship Signature Series Synthetic Oils and the company is quite excited with the results. AMSOIL is touting Signature Series as the undisputed world’s best motor oil.
What Is Signature Series?
Signature Series is AMSOIL’s most advanced line of synthetic motor oils for automotive applications with gasoline engines.
Signature Series is available in the following grades:
AMSOIL reformulated the Signature Series line in preparation for the new ILSAC GF-6 motor oil specification. This new industry specification will be introduced sometime in spring 2018.
The ILSAC GF-6 standard will address modern motor oil issues such as fuel economy improvement and the ability to perform well in turbo and gasoline direct injection (GDI) engines.
What Are The Benefits Of New Signature Series?
Once the new formula was finalized and tested, even AMSOIL was astonished at the finished product. Terms like “over-engineered”, “exotic” and “world’s best” were used to describe what was previously a very formidable product.
The upshot of the improvements were durability, cleaning ability and powerful heat resistance.
The latest rendition of Signature Series resists thickening, even after being exposed to extreme heat and long service intervals. AMSOIL boasts that the viscosity of Signature Series will be roughly the same after 25,000 miles of service as the day it was poured into the engine.
As for cleaning capability, AMSOIL offers that Signature Series has 50 per cent more cleaning properties than their OE Synthetic Series. As the OE Synthetic Series is a pretty good product in its own right, this is impressive. AMSOIL claims that there likely isn’t a motor oil made that would match the Signature Series cleaning power.
New Signature Series Test Data
AMSOIL performed extensive testing on the new Signature Series formula and the results were very impressive. Here are the highlights.
Engine Wear Testing
Signature Series 0W-20 (the lightest grade) was subjected to the Sequence IVA test. In this test, an engine alternates between 50 minutes of idling and 10 minutes of high RPM operation for 100 hours. This simulates conditions that can create excessive wear. Upon completion of the test, the camshaft was removed and measured for wear in 84 places. Signature Series showed 75 per cent less wear than required by the API SN specification.
Low-Speed Pre-Ignition Test
Many of today’s engines employ gasoline direct injection (GDI) systems. GDI engines can be prone to oil-related deposits. Deposits can cause low-speed pre-ignition (LSPI). This type of pre-ignition can cause poor operation and engine damage. Using the General Motors LSPI testing protocol, the new AMSOIL Signature Series formula provided 100% prevention against this issue.
Turbocharger Protection Testing
Turbochargers are back and more popular than ever. Hot turbos are notorious for being very hard on motor oil. AMSOIL put new Signature Series through the GM Turbo Coking Test. In this test, the motor oil is put through 2000 cycles of extreme heat soaks. To pass this test, the temperature within the turbo must not rise beyond 13 per cent. New Signature Series kept the temperature increase at just 3.6 per cent. This was 72 per cent better than the minimum requirement for the GM dexos 2 Gen 2 specification.
Astonishing Horsepower Preservation
This was our favorite and most telling “real world” test. AMSOIL installed the new Signature Series 5W-30 in a Ford F-150 with the turbocharged 3.5L Ecoboost engine. They measured the horsepower and torque output at the beginning of the test and then ran the truck for 100,000 miles (160,000 km). Oil was changed at 25,000 mile intervals. At the conclusion of the test, the engine was tested on the dynamometer again. As the chart below shows, horsepower and torque output remained all but unchanged. This is testament to AMSOIL’s extraordinary wear control.
Resistance To Viscosity Increase Test
The idea behind the Sequence IIV Test is to determine how well an engine oil resists thickening when exposed to extreme heat. AMSOIL Signature Series 5W-30 was installed in a test Chrysler 3.6L Pentastar engine. The test is then conducted with oil temperatures steady at 304°F. This is 100°F above normal oil temperatures. Signature Series thickened by just 6 per cent in this difficult test. The passing grade in this is to keep thickening under 150 per cent.
Volatility Resistance Test
This test measures how well a motor oil can resist oil burn-off. In the NOACK Volatility Test, a motor oil is exposed to very hot airflow set at 482°F for one hour. The oil is then tested to determine how much oil had burned off. New AMSOIL Signature Series 5W-20 lost just 5.8 per cent of its volume in this torture test. The API SN limit is 15 per cent.
Remarkable Cold-Cranking Ability
Receiving fast oil flow in cold weather is vital to prevent engine wear at start up. Each of the new AMSOIL Signature Series Synthetic Motor Oils boast spectacular cold-pour-point numbers. This is the temperature where an engine oil stops flowing.
0W-20 -53°C (-63°F)
5W-20 -50°C (-58°F)
0W-30 -50°C (-58°F)
5W-30 -50°C (-58°F)
10W-30 -47°C (-52°F)
0W-40 -50°C (-58°F)
5W-50 -48°C (-54°F)
Will the Signature Series Price Change?
No, the price of the latest Signature Series product line will not change. AMSOIL is suggesting that a higher volume of expensive ingredients was not required. What was more important was a strong commitment to research and development. AMSOIL has been formulating synthetic oils for 45 years and the new Signature Series line is the culmination of that legacy. AMSOIL customers can enjoy the dividends of this vast experience at a very reasonable price.
Where Can I Buy The New AMSOIL Signature Series Synthetic Oils?
We can sell AMSOIL Signature Series at wholesale prices. Request a price list using the contact form on this page or call us at 1-800-748-5781. We ship from 2 warehouses in Canada and 11 in the United States.
AMSOIL periodically publishes testing of their synthetic motor oils and sometimes they push the limits of conventional test methods, just to prove a point. The time they ran their synthetic 20W-50 in a Harley-Davidson in dyno testing until the engine temperature reached over 500°F comes to mind.
This time around, their Signature Series Synthetic 5W-30 was subjected to independent testing, but with a bit of a twist. The testing method was the ASTM “D7320 Sequence IIIG Engine Oil Test” which is used as a vital part of the process for engine oils to meet the API SN and ILSAC GF-5 specifications. It evaluates a motor oil’s ability to maintain viscosity, resist consumption, prevent deposits and control wear. AMSOIL changed things up by doubling the testing interval. In other words, they ran the same batch of 5W-30 oil through two complete test trials.
How the Testing Was Conducted
Using a GM 3800 V-6 engine as the test bed, the independent lab ran the engine through 100 hour test interval with a steady engine oil temperature of 150°C. In regular automotive applications, engine oil temperatures typically run at approximately 90°C.
After the 100 hour test, the engine was disassembled and measurements for camshaft and lifter wear, carbon deposits and engine oil viscosity were conducted. The engine was then reassembled using the same parts and the same batch of engine oil was reinstalled. The test was then rerun for another 100 hours under the exact same parameters.
The Results
Signature Series 5W-30 barely broke a sweat in the 100 hour trial and still aced requirements of the API SN and ILSAC GF-5 specifications by a mile after 200 hours.
Piston Deposits
A minimum grade for the API SN and ILSAC GF-5 specifications for piston deposits in the Sequence IIIG Engine Oil Test is a rating of 4. A score of 5.5 after 100 hours is regarded as excellent. In the 100 hour trial, AMSOIL Signature Series 5W-30 earned an excellent rating of 7.70. After 200 hours, the same batch of oil still attained a remarkable rating of 7.42. You’ll note in the photos below, the pistons are ultra-clean after the grueling 200 hour test. This is a testament to the AMSOIL Signature Series’ resistance to sludge, varnish and carbon deposits.
After 200 hours of high temperature testing using AMSOIL Signature Series, you could eat off of these pistons.
A competing motor fails the piston deposit portion of the Sequence IIIG Engine Oil Test after 100 hours.
Piston Ring Deposits
The API SN and ILSAC GF-5 specification requires that there can be no stuck piston rings after the 100 hour Sequence IIIG Engine Oil Test. This category of the test also addresses an engine oil’s ability to fight carbon deposits under hot operating conditions. After both the 100 and 200 hour tests, there were no stuck piston rings in the AMSOIL 5W-30 test.
Camshaft and Lift Wear Testing
In order for an engine oil to qualify for the API SN and ILSAC GF-5 specs, an oil must meet minimum cam and lifter wear thresholds in the Sequence IIIG Engine Oil Test. The minimum amount of wear is 60 microns. After 100 hours, the cam and lifter wear was a scant 14.8 microns with AMSOIL Signature Series 5W-30. The same cam and lifters were installed in the engine and another 100 hours was logged in testing. The total wear after 200 hours was just 17.6 microns.
AMSOIL Signature Series 5w-30 achieved remarkably low cam and lifter wear after 200 hours of the Sequence IIIG Engine Oil Test.
Viscosity Test Results
During high-temperature operation, engine oils have a tendency to thicken. This can lead to deposits, poor performance and compromised wear protection. In the 100 Hour Sequence IIIG Engine Oil Test, a viscosity increase of 50% is considered a very good result. The passing grade for the API SN and ILSAC GF-5 specifications is a 150% increase in viscosity. After 100 hours AMSOIL Signature Series 5W-30 had a viscosity increase of 27.6%. After 200 hours of testing, this viscosity increase was just 41.5%. A viscosity increase of 41.5% is considered outstanding after the 100 hour test, so AMSOIL’s performance after 200 hours is nothing short of spectacular.
Conclusion
We know of no other oil company that has publicly put their motor oil through a second helping of the 100 Hour Sequence IIIG Engine Oil Test. AMSOIL’s willingness to push the envelope with their products has always impressed us. The Signature Series Synthetic Oil formula proves itself to be stable under high temperatures and highly resistant to wear. This is the case in both testing and in the real-world conditions of your engine.
1-800-748-5781
AMSOIL has added a new 10W-30 diesel oil to their elite Signature Series Max-Duty line. The full-synthetic Signature Series Max-Duty 10W-30 meets the latest API CK-4 specifications along with a multitude of industry standards.
A reader asks: Will AMSOIL be coming out with a Signature Series 0W-16 oil anytime soon?
AMSOIL has reformulated their flagship Signature Series Synthetic Oils and the company is quite excited with the results. AMSOIL is touting Signature Series as the undisputed world’s best motor oil.
AMSOIL periodically publishes testing of their synthetic motor oils and sometimes they push the limits of conventional test methods, just to prove a point. The time they ran their 
