AMSOIL Synthetic 20W-50 Premium Protection Motor OilFormulated for use in both gasoline and diesel engines as well as motorcycle/ATV making this an ideal oil for fleets. Contains 1379 ppm zinc and 1266 ppm phosphorus for excellent flat tappet camshaft protection. Buy at wholesale in Canada or the USA. Request a price list using the form on the right of this page.

AMSOIL Synthetic 20W-50 package sizes include:
1-Quart Bottles (or buy case of 12)
1-Gallon Bottles (or buy case of 4)
16-Gallon Keg
30-Gallon Drum
55-Gallon Drum


AMSOIL Synthetic 20W-50 Premium Protection Motor Oil is a heavy-duty, high performance engine oil that is suitable for gasoline or diesel engines (API CI-4 Plus). It is also wet-clutch compatible making it suitable for motorcycle or ATV use. This versatility of this oil makes it ideal for fleet or farm use in cars, trucks, RV’s, heavy equipment, stationary engines, street rods and more. AMSOIL ARO 20W-50 is ideal for high mileage engines, towing, or applications exposed to extreme heat and heavy loads.

Fights Engine Wear

AMSOIL Synthetic 20W-50 Premium Protection Motor Oil’s heavy viscosity and hardy additive package all but eliminates metal-to-metal contact. The shear-stable formulation stays in viscosity grade over long periods under extreme loads and temperatures. The high zinc and phosphorus content makes this 20W-50 motor oil ideal for engines equipped with flat tappet cams.

Impervious to High Temperatures

AMSOIL Synthetic 20W-50 Premium Protection Motor Oil offers resistance to high operating temperatures that cannot be matched by regular motor oil. The exceptionally low volatility rate prevents oil burning and the resulting engine deposits. AMSOIL ARO stays in viscosity grade under extreme service over long intervals.

Capable of Extended Oil Change Intervals

AMSOIL Synthetic 20W-50 Premium Protection Motor Oil’s robust formulation neutralizes combustion by-products detergent keep engine internals clean over long periods. The synthetic formula is designed to maintain the viscosity grade much longer than conventional oils.

Winter Capable 20W-50 Oil

With a cold pour point of -36°C (-33°F), this synthetic 20W-50 can be used in cold weather.

Suitable for Motorcycle Wet Clutch Transmissions

AMSOIL Synthetic 20W-50 Premium Protection Motor Oil is ideal in motorcycle transmissions with wet clutches. This synthetic oil resists clutch plate glazing and improves shifting performance.

Applications

AMSOIL Synthetic 20W-50 Premium Protection Motor Oil is a versatile, heavy-duty engine oil that is suitable for gasoline or diesel engines, motorcycle/ATV, some transmissions and chaincases or anywhere that a 20W-50 is desired meeting the following specifications:

  • API SL, SJ, SH, SG
  • API CI-4 +, CH-4, CF, CF-2
  • ISO-L-EMA
  • Caterpillar ECF-1
  • JASO MA (Motorcycle)
  • MAN 271/3275
  • MTU Type 2
  • Cummins 20071, 20072, 20076, 20077
  • Volvo VDS-2, VDS
  • Mack EO-M+, EO-M
  • ACEA A3/B3, E3, E5
  • MB 228.1, 228.3, 229.1
  • Detroit Diesel 93K214

Mixing AMSOIL with Other Brands

AMSOIL Synthetic 20W-50 Premium Protection Motor Oil is compatible with all other brands of conventional and synthetic motor oils. While you can safely mix AMSOIL Synthetic Oil with other brands, this will reduce the drain interval and performance capabilities of AMSOIL oil.

Service Life

AMSOIL Synthetic 20W-50 Premium Protection Motor Oil is recommended for extended intervals in unmodified, mechanically-sound vehicles or equipment as follows:

Diesel Engine Service

  • Normal Service – Up to 25,000 miles (40,000 kilometres) or one year (whichever comes first) or longer based on oil analysis.
  • Severe Service*– Up to 15,000 miles (24,000 kilometres) or one year (whichever comes first) or longer based on oil analysis.

Gasoline Engine Service

  • Normal Service – Up to 15,000 miles (24,000 kilometres) or one year (whichever comes first) or longer based on oil analysis.
  • Severe Service* – Up to 15,000 miles (24,000 kilometres) or one year (whichever comes first) or longer based on oil analysis.

*Severe Service includes turbo or supercharged engines, commercial or fleet operation, vehicles with more than 100,000 miles (160,000 km) without prior continuous use of AMSOIL motor oil, frequent short trips of less than 10 miles (16 kilometres), heavy towing, snow-plow service or operation in dusty conditions.

Motorcycles, Small Engines, Stationary Engines, Heavy Equipment and Other Applications

Follow the manufacturer-recommended oil change interval.

Specifications

 AMSOIL High Performance Synthetic 20W-50 Motor Oil (ARO)

Kinematic Viscosity @ 100°C, cSt (ASTM D-445)

19.5

Kinematic Viscosity @ 40°C, cSt (ASTM D-445)

160.3

Viscosity Index (ASTM D-2270)

139

CCS Viscosity @ -15°C, cP (ASTM D 5293)

4636 (-15)

Pour Point °C (°F) (ASTM D 97)

-35 (-31)

Flash Point °C (°F) (ASTM D 92)

230 (46)

Fire Point °C (°F) (ASTM D-92)

248 (478)

High Temperature/High Shear @ 150°C and 1.0 X 106 s-1, cP (ASTM D 4683), cP

5.5

Four Ball Wear Test (ASTM D 4172 @ 40 kgf, 150°C, 1800 rpm, 1 hour, Scar in mm)

0.48

Noack Volatility, % weight loss (ASTM D5800)

4.8

Total Base Number

12.1

AMSOIL Synthetic 20W-50 Premium Protection Motor Oil
A synthetic 20W-50 motor oil that is suitable for gasoline and diesel engines as well as motorcycles and ATVs's.
Brand: AMSOIL
Manufacturer: AMSOIL
Model: Synthetic 20W-50 Engine OIL
Product ID: ARO