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AMSOIL Performance Test

  • AMSOIL Reduces Deposits

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

    AMSOIL High-Mileage

    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
  • AMSOIL Reduces Deposits

    AMSOIL 100% Synthetic High-Mileage Motor Oil excels at preventing deposits, while leading competitors fail to meet minimum industry standards.WW2

    AMSOIL High-Mileage

    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

  • AMSOIL Reduces Deposits

    Prevents deposits up to 60% better than Valvoline.WW3*

    AMSOIL High-Mileage
  • AMSOIL Reduces Deposits

    Prevents deposits up to 62% better than Mobil 1.WW4*

    AMSOIL High-Mileage

  • 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.

    AMSOIL High-Mileage
      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
  • Provides More Cleaning Power

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

    AMSOIL Extended Life

  • 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)

    AMSOIL Hybrid Motor Oil

    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
  • 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.

    AMSOIL CVT Fluid
    Belts of taxis with AMSOIL CVT Fluid installed

  • Signature Series Improves Startup Protection

    AMSOIL provides better cold cranking viscosity, helping improve wear protection for engine components at startup.PP ASTM D5293 Cold Crank (Lower=Better)

    AMSOIL Signature Series Motor Oil SAE 5W-30

    ASTM D5293 Cold Crank (Lower = Better)

      AMSOIL Signature Series(5W-30) Royal Purple High Performance (5W-30) Lucas (5W-30) Driven LS30 (5W-30) Red Line High Performance (5W-30) Royal Purple HPS (5W-30)
    Cranking Viscosity (㎫ ●s) 3800 4500 5000 5750 6100 6100
  • Signature Series Helps Keep Engines Cleaner, Longer

    AMSOIL Signature Series is fortified with a heavy treatment of detergent additives, delivering 28 percent more acid-neutralizing power than Mobil 1* and helping engines stay cleaner, longer.LL

    AMSOIL Signature Series

  • Signature Series Delivers Powerful Protection

    AMSOIL delivers powerful protection. How good is it?

    An independent lab compared AMSOIL synthetic motor oil head-to-head against a leading competitor in a 100,000-mile test P. AMSOIL provided far superior wear protection and kept bearings looking like.

    AMSOIL Signature Series Motor Oil
    Bearing using leading competitor oil vs bearing using AMSOIL oil
  • Signature Series fights wear.

    75% more engine protection against horsepower loss and wear.A Sequence IVA Engine Test - Lower Number = Less Wear

    AMSOIL Signature Series Motor Oil

    Sequence IVA Engine Test - Lower Number = Less Wear

      Industry Standard AMSOIL Signature Series 0W-20 Synthetic Motor Oil
    Average Cam Wear 90 20.28

  • Signature Series Protects Against LSPI

    AMSOIL Synthetic Motor Oils achieved 100% protection against LSPI.B

    Below is an example of piston damage due to an LSPI event observed during the testing of a competitor's motor oil. The red arrows indicate sections of the ring land that have broken away from the piston.

    AMSOIL Signature Series Motor Oil
    Example of piston damage due to an LSPI event observed during the testing of a competitor's motor oil.
  • Signature Series Guards Turbos

    Protects turbochargers 72% better than requiredC by the GM dexos1* Gen 2 specification.

    Signature Series controlled heat and minimized performance-robbing deposits on the turbo-bearing and shaft surfaces.

    AMSOIL Signature Series Motor Oil
    Example of minimized performance-robbing deposits on the turbo-bearing and shaft surfaces.

  • Signature Series Cleans

    AMSOIL Signature Series Synthetic Motor Oil has 50% more detergentsD to help keep oil passages clean and promote oil circulation. It provides 90% better protection against sludgeDD.

    Example of a virtually sludge-free oil pick-up tube screen.
    AMSOIL Signature Series Motor Oil
  • Signature Series Resists Viscosity Increase

    AMSOIL is barely challenged by the industry-standard testing, demonstrating only a 0.1% viscosity increase. Even when the test length is doubled, AMSOIL delivered twice the viscosity control required by the standard.GG

    AMSOIL Signature Series Motor Oil
    Sequence IIIH Engine Test (Lower Number = Better Viscosity Control)

    Sequence IIIH Engine Test (Lower Number = Better Viscosity Control)

      Industry Standard AMSOIL Standard Length AMSOIL Double Length
    Viscosity Increase % 100% 0.1% 49.6%

  • Signature Series Keeps Pistons Cleaner

    Even after doubling the length of the industry-standard test, AMSOIL delivered 40% cleaner pistons than required by the standard.FF

    Example of a clean piston after using AMSOIL product.
    AMSOIL Signature Series Motor Oil
  • OE Protects Against Wear

    Provides 47% more wear protection.G

    Peugeot TU3M Wear Test (Lower Number = Less Wear)
    AMSOIL OE Motor Oil

    Peugeot TU3M Wear Test (Lower Number = Less Wear)

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

  • 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* standardI. For even greater protection, Signature Series Max-Duty Synthetic Diesel Oil provides 6X more wear protection than required by the standardII.

    AMSOIL Diesel Oil
  • DOMINATOR® Protects Better

    DOMINATOR® Competition Diesel Oil delivers 50% more film thicknessQ 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)

    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

  • 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

    AMSOIL Diesel Oil
    Oil Consumption (Lower = Better)

    Oil Consumption (Lower = Better)

      CK-4 Limit AMSOIL Heavy-Duty AMSOIL Signature-Series
    g/kwh 0.5 0.17 0.12
  • 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 cleanlinessJ and withstanding the extra demands you place on the turbo when pulling heavy loads or updating the tune for maximum horsepower.

    AMSOIL Diesel Oil

  • 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.

    AMSOIL Diesel Oil
    NMMA FC-W Rust Test (Lower Number = Less Wear)

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

      AMSOIL Signature Series 15W-40 Lucas* 15W-40 Schaeffers* Durability Advantage 15W-40 Shell* Rotella T4 15W-40 Mobil* Delvac 1300 Super 15W-40 Reference oil (pass/fail limit)
    Max Cam Wear (µm) 17.25 33.63 39.5 30.63 36.69 30.75
  • 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

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

  • 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.

    Bottle of AMSOIL Diesel Oil SAE 0W-40
  • AMSOIL Resists Viscosity Breakdown

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

    AMSOIL Synthetic V-Twin Motorcycle Oil
    Viscosity Breakdown (Less Viscosity Loss = Better Protection)

    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

  • AMSOIL Delivers Superior Rust Protection

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

    AMSOIL Z-Rod Motor Oil SAE 10W-40
    Metal Plate with rust on it from a competing brand vs a metal plate with no rust from AMSOIL
  • 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

    AMSOIL Marine Gear Lube SAE 75W-90

  • SABER Professional Fights Carbon

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

    Metal Plate with rust on it from a competing brand vs a metal plate with no rust from AMSOIL
    AMSOIL SABER 2-Stroke Oil
  • AMSOIL Delivers Confident Clutch Feel

    AMSOIL provides excellent clutch protectionT. 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
    AMSOIL DIRT Motorcycle Oil

  • 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.
    AMSOIL 2-Stroke INTERCEPTOR Oil
  • 99% Efficiency at 20 Microns

    Filtering particles >20 microns fights engine wear.AA

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

  • 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)
    AMSOIL Upper Cylinder Lubricant

    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
  • P.i. Increases Horsepower

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

    Horsepower Comparison
    AMSOIL P.i.

    Horsepower Comparison

      Pre-Cleaning Power Post-Cleaning Power
    Horsepower 248.9 283.8

  • AMSOIL Improves Lubricity

    Testing reveals AMSOIL Diesel All-in-One provides significant lubricity improvement in diesel fuels found across the U.S., delivering improved wear protection.OO

    Lubricity Improvement (The lower the number, the better)
    AMSOIL Diesel All-In-One

    Lubricity Improvement (The lower the number, the better)

    ASTM D6079 Wear Scar Diameter Average um Illinois Delaware Colorado Washington Tennessee Texas Pennsylvania North Dakota Wyoming
    Fuel Treated with AMSOIL Diesel All-In-One 381 392 389 327 350 363 355 397 349
    Baseline Fuel 484 551 530 535 536 520 540 512 509

    Note: D975 industry diesel fuel standard requires fuel to be 520 or less EMA and Canada would like that to be 460 or less

  • AMSOIL Fights Corrosion

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

    Metal exposed to Sea Foam vs metal exposed to AMSOIL.
    AMSOIL Gasoline Stabilizer

  • AMSOIL Improves Stability

    AMSOIL provides fuel stability that Sea Foam* Motor Treatment can't match, helping maintain startability and protect against the formation of varnish and gum.Z

    Fuel Stability in the 24-Hour (1,440-minute) ASTM D525 Test
    AMSOIL Gasoline Stabilizer

    Fuel Stability in the 24-Hour (1,440-minute) ASTM D525 Test

      Base Fuel Sea Foam Motor Treatment® AMSOIL Gasoline Stabilizer
    Minutes 745 685 1440
  • AMSOIL Resists Corrosion

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

    Cast-Iron and Copper Plates with virtually no sign of corrosion
    AMSOIL Antifreeze & Coolant

  • AMSOIL Resists Cavitation

    In independent, industry-standard testing, cylinder liners protected by AMSOIL showed virtually no signs of cavitation.II

    Cylinder Linder with virtually no signs of cavitation
    AMSOIL Antifreese & Coolant
  • Delivers Outstanding Efficiency

    Fine-particle filtration down to 2 microns.

    Cylinder Linder with virtually no signs of cavitation

  • A Study of LUCAS Semi-Synthetic 2-Cycle Oil in ECHO* String Trimmers (G3466)

    AMSOIL SABER® Professional Synthetic 2-Stroke Oil mixed at 50:1 provided improved resistance to performance-robbing deposits and power loss compared to LUCAS Semi-Synthetic 2-Cycle Oil in ECHO string trimmers.

    Open new tab and view a study of LUCAS Semi-Synthetic 2-Cycle Oil in ECHO* String Trimmers (G3466)
  • Redmax 100:1 Trimmer Technical Study (G3522)

    AMSOIL SABER® Professional Synthetic 2-Stroke Oil mixed at 100:1 resisted deposits better than RedMax* 2-Stroke Engine Oil mixed at 50:1.

    Open new tab and view Redmax 100:1 Trimmer Technical Study (G3522)

  • 3,469-Mile Case Study in Rotax E-TEC Engine (G3038) (1.1 MB PDF)

    AMSOIL submitted the pistons from a Ski-Doo Rotax E-TEC 800R engine to an ASTM-calibrated rater following 3,469 miles of aggressive trail riding to reveal that AMSOIL INTERCEPTOR® Synthetic 2-Stroke Oil provided outstanding protection and prevented piston skirt scuffing and ring sticking.

    Open new tab and view 3,469-Mile Case Study in Rotax E-TEC Engine
  • ECHO String Trimmer Technical Study (G3455)

    AMSOIL SABER® Professional Synthetic 2-Stroke Oil resisted performance-robbing deposits and maintained power and performance in ECHO string trimmers.

    Open new tab and view ECHO String Trimmer Technical Study (G3455)
View More In The Performance Test Archive

The AMSOIL Performance Test Archive documents the consistent high performance of AMSOIL synthetic lubricants throughout the company’s history. Enter the archive to review samples to review samples of past performance tests and technical studies.


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