Home » Schaeffer vs Amsoil Oil Comparison

Schaeffer vs Amsoil Oil Comparison

Do you want to know which engine oil is better, Schaeffer or Amsoil? This comprehensive comparison of the two manufacturers’ oils will assist you.

We’ll go over a quick comparison, followed by a more in-depth examination of each. Everything you need to know about what goes into the oil, as well as the advantages it may provide, is covered here.

Schaeffer vs Amsoil Oil Comparsion

What is Schaeffer SynShield Oil? – Overview of Features

Schaeffer vs Amsoil Oil Comparsion

SynShield Durability Advantage SAE 15W-40 is a premium advanced performance synthetic plus heavy-duty diesel engine oil created to provide maximum protection against wear, oxidation, deposit formation, soot impurity, and aeration. SynShield Durability Advantage SAE 15W-40 delivers exceptional equipment durability and longevity under demanding, severe duty operation conditions.

A 15W-40 Engine Oil from Royal Purple is a premium advanced performance, synthetic plus, heavy-duty diesel engine oil that offers superior protection against wear, oxidation, deposit formation, soot contamination and aeration.

SynShield® Durability Advantage 15W-40 Engine Oil is designed to give equipment long service life and excellent durability in demanding, extreme operating situations. SynShield® Durability Advantage 15W-40 Engine Oil has a slippery, tenacious sheath that prevents metal-to-metal contact with the help of our proprietary friction modifiers, Micron Moly® and Penetro®, creating a smooth, tight seal. This additional layer of protection against wear on bearings, rings, pistons, cylinders, and valve trains significantly extends equipment lifespan.

Our 15W-40 oil is suited for diesel engines that are 2007 or 2010 standards and have heavy exhaust gas recirculation (EGR) and after-treatment systems such as diesel particulate filters (DPFs) with or without diesel oxidation catalysts (DOCs). SynShield® Durability Advantage 15W-40 Oil can also be used in low-emission certified diesel engines that include EGR, non-EGR-containing diesels, and off-highway diesel engines.

SynShield Durability Advantage SAE 15W-40 is a synthetic blend of three microlots, plus an antiwear additive. Two proven friction modifiers are present in SynShieldTM Durability Advantage SAE 15W-40: Micron Moly®, a liquid soluble type of moly, and Schaeffer Mfg.’s own proprietary additive Penetro®. These friction modifiers, once plated, create a lengthy-lasting, slippery, tenacious lubricant film that prevents metal-to-metal contact and frictional wear that can cause damage.

  • Increased fuel economy
  • A low coefficient of friction
  • Significantly less bearing, ring, piston, cylinder and valve-train wear
  • Less downtime with reduced maintenance
  • Increased engine efficiency, durability and life

Schaeffer SynShield Major Specifications:

  • Specific Gravity @ 60°F/15°C: .8666
  • Viscosity 40°C cSt (ASTM D445): 111.7
  • Viscosity 100°C cSt (ASTM D445): 15.51
  • Noack Volatility % Evaporative Loss (ASTM D5800): 10
  • High Temperature High Shear Viscosity 302°F/150°C cP (ASTM D4683): 4.1
  • Pour Point °F/°C (ASTM D97/D5950):-38°/-39°
  • Shear Stability % Viscosity Loss – 90 Passes (ASTM D7109): 9.96%
  • TEOST MHT (ASTM D7097) Total Deposits, mg: 20.7

SynShield™ Durability Advantage SAE 15W-40 meets and exceeds the following manufacturers’ specifications and requirements: 

API Service Classifications CK-4/CJ-4; Military Specification MIL-PRF2104K; ACEA E7-16; ACEA E9-16; Global Specification DHD-1; Caterpillar ECF-3; Cummins CES 20081, CES 20086; Detroit Diesel Power Guard Oil Specifications: DDC93K218 and DDC93K222; Deutz DQC III-10 LA; Ford WSS-M2C171-E, WSS-M2C171-F1; JASO DH-2; Mack EO-O Premium Plus, Mack EOS4.5; MAN 3275, MAN 3575; MB 228.3; MB 228.31; MTU Category Type 2 and 2.1; Renault VI RLD-3, RLD-4; Scania LDF-2; Volvo VDS 4, VDS 4.5; Navistar; John Deere; CHN (Case-New Holland).

AMSOIL does not advocate for extended drain intervals after using oils that have been mixed. It’s dangerous to put aftermarket oil additives in AMSOIL motor oils.
Purchase link: Buy Schaeffer SynShield at Amazon

Benefits of Schaeffer SynShield

Schaeffer vs Amsoil Oil Comparsion

  • Capable of exceptionally long drain intervals
  • Fights wear
  • Improves fuel economy
  • Diminishes the effects of acid and soot
  • Prevents deposits for clean engine internals
  • Combats corrosion

What is AMSOIL Heavy-Duty Oil? – Overview of Features

Schaeffer vs Amsoil Oil Comparsion
AMSOIL Synthetic Heavy Duty Diesel & Marine Motor Oil is a high-performance diesel oil that performs well in all types of diesel engines, where effective wear and deposit control is critical. Its Total Base Number (TBN) of 12 neutralizes acids and controls soot thickening from exhaust gas recirculation (EGR) and blow-by to protect against corrosion, cylinder bore polishing (wear), varnish and sludge deposits thanks to heavy-duty dispersant/detergent additives. For long-lasting performance and protection, AMSOIL 15W-40 Diesel Oil outlasts other petroleum oils in terms of heat resistance and breakdown.

In 1972, AMSOIL, the market leader in automobile synthetic lubrication, developed the first API-approved synthetic motor oil. To get the finest outcome, rely on AMSOIL’s decades of expertise with Synthetic The First in SyntheticsTM to do the best job possible protecting your engine.

AMSOIL Heavy-Duty Synthetic Diesel Oil is a 100 percent synthetic engine oil intended for heavy equipment. Provides 4 times the wear resistance required by DFS 93K222 specification, as determined by testing for teasers Detroit Diesel DD13, which ensures that trucks and heavy equipment operate without interruption at maximum loads. Diesel oil with excellent resistance offers optimum protection against wear, tear and pitting of engine components, which is a significant benefit when compared to mineral, semi-synthetic oils and other manufacturers’ oils.

Extends Drain Intervals

The drain intervals may be extended well beyond those recommended for regular petroleum oils with AMSOIL Synthetic Heavy Duty Diesel & Marine Motor Oil. Its advanced synthetic composition and long-drain additive chemistry provide maximum engine protection, cleanliness, and performance over extended drain periods while also reducing car maintenance and waste-oil disposal expenses.

Viscosity Control

AMSOIL Heavy-Duty Synthetic Diesel Oil is a highly refined synthetic base oil that uses advanced synthetic base oils and detergent/dispersant additives to minimize viscosity change while keeping soot particles suspended independently, preventing the formation of larger, wear-causing particles. Lower volatility also helps Heavy-Duty Synthetic Diesel Oil retain its viscosity after high-temperature service for improved engine protection and higher fuel efficiency.

Controls Soot and Wear

The detergent/dispersant additives in AMSOIL Synthetic Heavy Duty Diesel & Marine Motor Oil effectively attract soot particles and keep them suspended. It keeps soot particles separate from one another, preventing them from combining to form larger, wear-inducing particles. Soot-related friction is reduced owing to the decreased viscosity increase.

Reduces Oil Consumption and Emissions

Lower volatility is one of the benefits of AMSOIL Synthetic Heavy Duty Diesel & Marine Motor Oil. Because less vapor enters the combustion chamber, oil usage and emissions are reduced. AMSOIL 15W-40 Diesel Oil’s viscosity is better preserved after high-temperature service as a result of decreased volatility.

Excellent Cold-Flow Properties

AMSOIL Synthetic Heavy Duty Diesel & Marine Motor Oil is a heavy-duty diesel and marine engine oil that minimizes engine wear during startup (down to -44°F). In terms of reducing the impact of cold weather operation, AMSOIL Synthetic Heavy Duty Diesel Oil outperforms conventional 15W-40 petroleum oils.


AMSOIL Synthetic Heavy Duty Diesel & Marine Motor Oil is designed for a wide range of light- and heavy-duty uses, including over-the-road trucks, off-road construction, marine engines, farm equipment, mining equipment, industrial (pumps & generators), and personal vehicle or commercial transportation. It’s perfect for diesel fuels with low or high sulfur content in standard, turbocharged, or supercharged engines that use EGR systems.

AMSOIL Heavy-Duty Oil Major Specifications

AMSOIL Synthetic Heavy Duty Diesel & Marine Motor Oil is suitable for diesel engines, gasoline engines, and other applications that require any of the following requirements:

  • API CK-4, CJ-4, CI-4+, CF
  • Volvo VDS4.5, VDS4, VDS3
  • Allison TES-439
  • Mack EOS-4.5, EO-O
  • Renault RLD-4, RLD-3
  • Cummins CES20086, CES20081
  • Caterpillar ECF-2, ECF-3, ECF-1-a
  • DDC 93K218, 93K215, 93K214
  • DFS 93K222
  • ACEA E9, E7
  • MB 228.31
  • MAN 3575
  • MTU Type 2.1, II, I
  • JASO DH-2
  • Deutz DQC III-10LA
  • Chrysler MS 10902
  • Ford WSS-M2C171-F1


AMSOIL Heavy-Duty Synthetic Diesel Oil is compatible with other conventional and synthetic engine oils. Mixing AMSOIL diesel oils with other oils, however, will reduce the performance benefits. Aftermarket oil additives are for use with AMSOIL synthetic diesel oils.

Purchase link: Buy AMSOIL Heavy-Duty at Amazon

Benefits of Amsoil Synthetic Heavy Duty Oil

  • Superior performance in extreme conditions, withstanding long periods of operation.
  • The oil change frequency is reduced, and the engine run-time is increased.
  • Reduced make-up oil usage during operation lowers operating costs.
  • Both new and old engines using up to 500 ppm sulfur diesel fuel can be protected against corrosion with an extended drain interval of 60 minutes.
  • Designed to provide a smooth start in chilly weather.
  • Engineered to survive a long time on the critical wear surfaces.
  • Long gasket and sealing life.
  • One oil for mixed diesel vehicles.
  • Aftertreatment lifetime (DPF, DOC, and SCR).
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