Performance Tests

Signature Series Guaranteed Protection

Guaranteed protection for up to 25,000 miles or 1 year.^W

^WWhichever comes first, in personal vehicles not operating under severe service. For severe-service definition, click here.

Signature Series Preserves Horsepower & Torque

AMSOIL Signature Series 100% Synthetic Motor Oil is built to help engines run stronger, longer. We installed Signature Series 5W-30 100% Synthetic Motor Oil in a 2025 Ford* F-150* Raptor* to test its ability to protect against torque and horsepower loss using 25,000-mile drain intervals. Power sweeps were done at the beginning and end of the test to evaluate horsepower and torque retention. As the graph shows, Signature Series maintained performance throughout the 125,000-mile test, even under elevated stresses of a 3.5L high-output engine.^B

Horsepower and torque measured at the start and end of the 125,000-mile test.
Max Start of Test Torque	Max Start of Test Horsepower	Max End of Test Torque	Max End of Test Horsepower
430.31	330.99	438.39	337.66

^BBased on comparative start- and end-of-test horsepower and torque measurements.
*All trademarked names and images are the property of their respective owners and may be registered marks in some countries. No affiliation or endorsement claim, express or implied, is made by their use.

Signature Series Protects Against LSPI

Even after 25,000 miles of use, Signature Series delivers 4X more piston protection against LSPI.^D

^DBased on AMSOIL Signature Series 5W-30 100% Synthetic Motor Oil in a modified Sequence IX aged-oil LSPI test after 25-000-mile service interval.

Signature Series Protects Against Volatility

Signature Series delivers 2X better protection against volatility.^E

Graph showing AMSOIL Signature Series delivers 2X better protection against volatility, helping reduce oil consumption, minimize top-offs and keep engines cleaner over time.

	AMSOIL Signature Series 100% Synthetic Motor Oil	ILSAC GF-7 Maximum Allowable Volatility
Volatility (%)	7.2	15

^EBased on AMSOIL Signature Series 0W-20 100% Synthetic Motor Oil compared to the API SQ limit using the ASTM D5800 NOACK volatility test.

Signature Series Fights Deposits

Signature Series provides 72% more protection against piston-deposit formation than industry standards.^M

Image showing results of Sequence IIIH testing, AMSOIL Signature Series delivers 72% more protection against piston deposits than required by industry standards

Even after doubling the length of the industry-standard test, Signature Series delivered 31% better protection than required.^P

Image showing results after doubling the length of the Sequence IIIH test, Signature Series provided 31% better protection than required - demonstrating its ability to maintain cleanliness far beyond industry standards.

^MBased on AMSOIL Signature Series 5W-30 100% Synthetic Motor Oil results in the Sequence IIIH test.
^PBased on AMSOIL Signature Series 5W-30 100% Synthetic Motor Oil results in a double-length Sequence IIIH test.

Signature Series Prevents Sludge

No sludge, just protection. ^U

Image showing 125,000-mile accumulation study using AMSOIL Signature Series 5W-30 100% Synthetic Motor Oil in a 2025 Ford* F-150* Raptor* equipped with a 3.5L high-output engine which had 0% oil-screen plugging.

^uAs demonstrated in a 125,000-mile accumulation study using AMSOIL Signature Series 5W-30 100% Synthetic Motor Oil in a 2025 Ford* F-150* Raptor* equipped with a 3.5L high-output engine which had 0% oil-screen plugging.

AMSOIL Reduces Deposits

AMSOIL 100% Synthetic High-Mileage Motor Oil provides up to 62% better deposit prevention. ^WW1

TEOST 33C (ASTM D6335) Lower = Better

	AMSOIL 0W-20 100% Synthetic High-Mileage Motor Oil	Valvoline* Full Synthetic High Mileage with MaxLife* Technology 0W-20 Motor Oil	Mobil 1* High Mileage 0W-20 Full Synthetic Motor Oil
Total Deposits (mg)	15.4	39.3	40.5

^WW1Based on independent testing of AMSOIL 0W-20 100% Synthetic High-Mileage Motor Oil, Valvoline* Full Synthetic High-Mileage with MaxLife* Technology 0W-20 Motor Oil (batch codeJ2622C5 purchased December 21, 2022) and Mobil 1* High-Mileage 0W-20 Full Synthetic Motor Oil (batch code 11022L21A 6606 purchased December 8, 2022) in the industry-standard TEOST 33C Test (ASTM D6335) as required by the ILSAC GF-6 specification. *All trademarked names are the property of their respective owners and may be registered marks in some countries. No affiliation or endorsement claim, express or implied, is made by their use.

AMSOIL Reduces Sludge

AMSOIL 100% Synthetic High-Mileage Motor Oil reduced sludge by 67%, ^VV demonstrating its cleaning power that helps engines last longer and perform better.

	0 Hours	134 Hours	158 Hours	178 Hours	Oil changed to AMSOIL 0W-20 High-Mileage Motor Oil	208 Hours	229 Hours	252 Hours	272 Hours
Total Engine Sludge Rating	0	1.85	2.25	3.12		1.9	1.44	1.4	1

^VVBased on independent testing of AMSOIL 0W-20 100% Synthetic High-Mileage Motor Oil using a modified Sequence VH Test (ASTM D8256).

Provides More Cleaning Power

AMSOIL Extended-Life Synthetic Motor Oil has 37% more cleaning power to help keep your engine running smoother, longer.^UU

^UUCompared to AMSOIL OE Synthetic Motor Oil.

AMSOIL Delivers Better Cold-Temperature Protection

AMSOIL provides up to 16% better low-temperature viscosity than Mobil 1, ^* delivering better protection at startup.^TT Cold-Cranking Simulator. ASTM D5293 (Lower = Better)

Cold-Cranking Simulator ASTM D5293 (Lower = Better)

	AMSOIL 0W-20 100% Synthetic Hybrid Motor Oil	Mobil 1 0W-20 Hybrid Full Synthetic Motor Oil
Viscosity (cP)	5476	6517

^TTBased on independent, third-party testing of AMSOIL 0W-20 100% Synthetic Hybrid Motor Oil and Mobil 1 0W-20 Hybrid Full Synthetic Motor Oil (batch code 10222M14A RN6613 326900 D340BUDE015 purchased April 17, 2023) in the industry-standard ASTM D5293 Cold Crank Simulator test as required by SAE J300. ^*All trademarked names are the property of their respective owners and may be registered marks in some countries. No affiliation or endorsement claim, express or implied, is made by their use.

CVT Fluid

AMSOIL delivers outstanding protection in severe service.

AMSOIL CVT Fluid was installed in four Las Vegas taxis, each driven 100,000 miles. As shown in the belt photos below, AMSOIL CVT Fluid delivered outstanding protection in severe-service conditions.

CVT Fluid

AMSOIL delivers outstanding protection in severe service.

AMSOIL CVT Fluid was installed in four Las Vegas taxis, each driven 100,000 miles. As shown in the belt photos below, AMSOIL CVT Fluid delivered outstanding protection in severe-service conditions.

OE Protects Against Wear

Provides 47% more wear protection.^G

Peugeot TU3M Wear Test (Lower Number = Less Wear)

	Industry-Standard Maximum Allowable Limit	AMSOIL OE 0W-20
Max Cam Wear (µm)	15	8

^GBased on independent testing of OE 0W-20 in the Peugeot TU3M Weat Test as required by the dexos1 Gen 2 specification.

AMSOIL Synthetic Diesel Oil Delivers More Wear Protection

Independent testing shows our Heavy-Duty Synthetic Diesel Oil delivers 4X more protection against wear than required by Detroit Diesel's^* standard^I. For even greater protection, Signature Series Max-Duty Synthetic Diesel Oil provides 6X more wear protection than required by the standard^II.

^IBased on independent testing in the Detroit Diesel DD13 Scuffing Test for specification DFS 93K222 using 10W-30 as worst-case representation.
^IIBased on independent testing in the Detroit Diesel DD13 Scuffing Test for specification DFS 93K222 using 5W-30 as worst-case representation.
^*All trademarked names and images are the property of their respective owners and may be registered marks in some countries. No affiliation or endorsement claim, express or implied, is made by their use.

DOMINATOR^® Protects Better

DOMINATOR^® Competition Diesel Oil delivers 50% more film thickness^Q to withstand high cylinder pressures and protect against wear.

AMSOIL DOMINATOR® Competition Diesel Oil SAE 20W-50

High-Temperature/High-Shear (HTHS) Viscosity (Higher = Better Wear Protection)

	AMSOIL DOMINATOR® 20W-50 Diesel Oil	15W-40 Diesel Oil
Viscosity, cP	5.5	3.5

^QCompared to the 3.5 cP HTHS limit for SAE 15W-40.

Synthetic Diesel Oil Reduces Oil Consumption

Heavy-Duty Synthetic Diesel Oil provides up to 66% less oil consumption, while Signature Series Max-Duty Synthetic Diesel Oil provides up to 76% less oil consumption.^L

Oil Consumption (Lower = Better)

	CK-4 Limit	AMSOIL Heavy-Duty	AMSOIL Signature-Series
g/kwh	0.5	0.17	0.12

^LThan required by the API CK-4 standard in the Caterpillar-1N oil consumption test.

Signature Series Keeps Turbos Clean

AMSOIL Signature Series Max-Duty Synthetic Diesel Oil provides protection boosted to the max, delivering up to 60% better turbo cleanliness^J and withstanding the extra demands you place on the turbo when pulling heavy loads or updating the tune for maximum horsepower.

^JBased on specification standards of CAT C13 2nd Ring Top Land Carbon testing.

Signature Series Protects Against Rust

Provides up to 2X better rust protection.^K

Test results describe and represent properties of oils that were acquired on the dates listed in Table 1 (see www.amsoil.com/rusttest.aspx). Results do not apply to any subsequent reformulations of such oils or to new oils introduced after completion of testing. All oils were available to consumers at the time of purchase. Testing was completed in November 2017.

NMMA FC-W Rust Test (Lower Number = Less Corrosion)

	AMSOIL Signature Series 15W-40	Lucas* 15W-40	Schaeffers* Durability Advantage 15W-40	Shell* Rotella T4 15W-40	Mobil* Delvac 1300 Super 15W-40
Max Cam Wear (µm)	17.25	33.63	39.5	30.63	36.69

^KBased on industry standard testing using the NMMA FC-W Rust Test.
^*All trademarked names and images are the property of their respective owners and may be registered marks in some countries. No affiliation or endorsement claim, express or implied, is made by their use.

Signature Series Fights Wear

AMSOIL delivers powerful engine protection . How good is it? In independent testing compared to a leading brand, AMSOIL provided long-lasting wear protection, keeping cylinder linders looking like new.^DD

Cylinder liner that use competitor oil appearing severely scuffed vs. cyliner liner using AMSOIL oil appearing non-scuffed.

^DDBased on independent testing of AMSOIL 5W-30 Signature Series Max-Duty Synthetic Diesel Oil and a leading conventional 15-40 diesel oil using the Detroit Diesel* DD13 Scuffing Test for specification DFS 93K222.
^*All trademarked names and images are the property of their respective owners and may be registered marks in some countries. No affiliation or endorsement claim, express or implied, is made by their use.

Signature Series Excels in Extreme Cold

AMSOIL 0W-40 Signature Series Max-Duty Synthetic Diesel Oil delivers 4X better cold-temperature performance when compared to SAE 15W-40 oil in ASTM D5293 Cold Cranking Viscosity Test.

AMSOIL Resists Viscosity Breakdown

AMSOIL resists viscosity breakdown 6X better than Harley-Davidson^* SYN3^* for improved protection against compensator and transmission gear wear.^BB

Viscosity Breakdown (Less Viscosity Loss = Better Protection)

	AMSOIL Synthetic V-Twin Motorcyle Oil	Harley-Davidson Screamin' Eagle SYN3
% Viscosity Loss in the CEC L45-KRL, ASTM D445 Test	-3.48	-25.32

^BBBased on testing of AMSOIL 20W-50 Synthetic V-Twin Motorcycle Oil purchased on 1/26/24 and Harley-Davison Screamin' Eagle SYN3 purchased on 1/26/24 in the CEC L45-KRL, ASTM D445 test.
^*All trademarked names and images are the property of their respective owners and may be registered marks in some countries. No affiliation or endorsement claim, express of implied, is made by their use.

AMSOIL Delivers Superior Rust Protection

In industry-standard testing, AMSOIL Z-ROD® completely prevented rust formation while a leading competitor did not.^JJ

^JJBased upon in-house testing of AMSOIL Z-ROD 10W-40 and a leading competitor obtained on 7/25/2019 in ASTM D1748-10.

AMSOIL Fights Water Contamination

AMSOIL Synthetic Marine Gear Lube delivers advanced outboard protection against power loss and gear wear, even with up to 15 percent water contamination.^V

^VBased upon AMSOIL testing of AMSOIL Synthetic Marine Gear Lube 75W-90 in ASTM 3233 and ASTM D892.

SABER Professional Fights Carbon

Equipment using SABER Professional was 96% carbon-free ^N.

^NBased on spark-arrestor testing.

AMSOIL Delivers Confident Clutch Feel

AMSOIL provides excellent clutch protection^T. How good is it? In extreme simulated-start testing, AMSOIL provided superior wear protection and kept clutch plates looking new.

Clutch Plates: AMSOIL Synthetic Dirt Bike Oil (32 starts): No discoloration and good overall condition. Leading OEM Oil (16 starts): Discoloration and wear

^TBased on dyno testing of a Honda^* CRF450 dirt bike using AMSOIL 10W-40 Synthetic Dirt Bike Oil and leading original equipment manufacturer 10W-40 conventional dirt bike oil.
^*All trademarked names and images are the property of their respective owners and may be registered marks in some countries. No affiliation or endorsement claim, express or implied, is made by their use.

INTERCEPTOR Fights Wear and Deposits

AMSOIL INTERCEPTOR® Synthetic 2-Stroke Oil delivered outstanding wear protection and cleanliness in a rental sled throughout 1,617 miles (2,602 km) of abuse.^CC

AMSOIL kept pistons virtually free of carbon with nearly all coating intact. AMSOIL fought the formation of carbon deposits, allowing power valves to move freely.

^CCBased upon use of a new 2019 Polaris^* RMK^* 850 as a rental sled at Grizzly Lodge December 2018 - February 2019.
^*All trademarked names and images are the property of their respective owners and may be registered marks in some countries. No affiliation or endorsement claim, express or implied, is made by their use.

99% Efficiency at 20 Microns

Filtering particles >20 microns fights engine wear.^AA

Challenger B @ 40 microns, Challengar A @ 30 microns, AMSOIL @ 20 microns

^AAIn accordance with industry-standard ISO SO 4548-12.

Preserves Horsepower and Performance

AMSOIL delivers 18 percent more lubricity than Lucas* and 20 percent more than Sea Foam* for better retention of horsepower and fuel economy.^R

Lubricity Performance (Measured by Wear Scar in Modified ASTM D6079, Smaller Number = Better Lubricity)

	Base Fuel (E10)	Lucas	Sea Foam	AMSOIL
Average Wear Scar (µm)	807 µm	786 µm	803 µm	640 µm

^RBased on independent testing of AMSOIL Upper Cylinder Lubricant, Lucas Upper Cylinder Libricant and Sea Foam Motor Treatment obtaind on 02/13/2019 using the ASTM D6079 modified for use with gasoline.
^*All trademarked names and images are the property of their respective owners and may be registered marks in some countries. No affiliation or endorsement claim, express or implied, is made by their use.

P.i. Increases Horsepower

AMSOIL P.i.® restores up to 14% horsepower.^NN

Horsepower Comparison

	Pre-Cleaning Power	Post-Cleaning Power
Horsepower	248.9	283.8

^NNBased on third-party testing in a 2016 Chevrolet^* Silverado^*1500, 5.3L V-8 GDI with 100,616 miles, using one tank treated with AMSOIL P.i. Actual results may vary.
^*All trademarked names and images are the property of their respective owners and may be registered marks in some countries. No affiliation or endorsement claim, express or implied, is made by their use.

AMSOIL Fights Corrosion

AMSOIL provides corrosion protection Sea Foam^* Motor Treatment can’t match, helping maintain power and performance and keeping metal corrosion free, even when subjected to salt water.^X

Metal exposed to Sea Foam vs metal exposed to AMSOIL.

^*Based on independent third-party testing of AMSOIL Gasoline Stabilizer obtained July 1, 2022, and Sea Foam Motor Treatment purchased June 30, 2022, in a modified NACE TM0172 using synthetic sea water per ASTM D665B.
^*All trademarked names and images are the property of their respective owners and may be registered marks in some countries. No affiliation or endorsement claim, express or implied, is made by their use.

AMSOIL Improves Stability

AMSOIL Gasoline Stabilizer delivers 8X longer fuel stability than Sea Foam^® Motor Treatment in the triple-length gasoline oxidation stability test (ASTM D525), helping maintain startability and protect against the formation of varnish and gum.^Z

Fuel Stability
Triple-Length Gasoline Oxidation Stability Test (ASTM D525)

	Sea Foam	AMSOIL
Minutes	536	4,320

^ZBased on independent third-party testing of AMSOIL Gasoline Stabilizer obtained July 1, 2022 and Sea Foam Motor Treatment purchased June 30, 2022 in a triple-length gasoline oxidation stability test (ASTM D525) using test fuel containing no oxidation-stability-improving additives.
^*All trademarked names and images are the property of their respective owners and may be registered marks in some countries. No affiliation or endorsement claim, express or implied, is made by their use.

AMSOIL Resists Corrosion

In independent, industry-standard testing, cast-iron and copper plates protected by AMSOIL showed virtually no signs of corrosion. ^HH