For use in both diesel and gasoline engines. Ideal for applications where the extra protection of a higher-viscosity oil is desired. The higher viscosity may help reduce motor oil consumption in equipment experiencing higher than normal oil usage rates while running lower viscosity lubricants.
Package sizes include:
Quart Bottle
Gallon Bottle
16-Gallon Keg
30-Gallon Drum
55-Gallon Drum
AMSOIL Synthetic 20W-50 Premium Protection Motor Oil is a multi-use, premium synthetic lubricant for applications that require or benefit from a higher viscosity oil. It is recommended for air and liquid cooled, large or small gasoline and diesel engines, transmissions and chaincase applications where 20W-50 oil is required with any of the following specifications:
• API SL, SJ, SH, SG
• API CI-4 Plus, 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
• VDS-2, VDS
• Mack EO-M+
• ACEA A3/B3, E3, E5
• MB 228.3, 229.1
• Detroit Diesel 93K214
AMSOIL Premium Protection Synthetic Motor Oil is formulated to provide superior protection and performance in a wide variety of demanding applications. Its unique combination of synthetic base stocks and a superior additive package results in a formulation that exceeds the requirements of most gasoline or diesel applications that call for 20W-50 motor oil. Premium Protection Synthetic Motor Oil is ideal for high-mileage vehicles and high-stress vehicles subject to hot temperatures, heavy hauling, trailer pulling or off-road use. It provides the extra
anti-wear protection required by engines with flat-tappet cams and high-tension valve springs. AMSOIL Premium Protection Synthetic Motor Oil offers flexibility and performance beyond conventional oils for convenience and trouble-free operation.
AMSOIL, the leader in automotive synthetic lubrication, produced the world's first API qualified synthetic motor oil in 1972. Trust the extensive experience of AMSOIL The First in Synthetics® to do the best job protecting your engine.
AMSOIL Premium Protection Synthetic Motor Oil is high-viscosity oil engineered to protect against metal-to-metal contact. It resists viscosity shear and is formulated with a heavy treatment of zinc and other anti-wear additives for excellent protection of gears, bearings, cam lobes and other high-pressure components in engines and transmissions. AMSOIL Premium Protection Synthetic Motor Oil helps extend equipment life.
AMSOIL Premium Protection Synthetic Motor Oil contains no friction modifiers, making it ideal for motorcycles, maintenance equipment and other wet-clutch transmission applications. Formulated to prevent clutch glazing and slippage, it helps ensure smooth clutch engagement and long-term, dependable transmission operation. Premium Protection Synthetic Motor Oil reduces clutch wear for extended transmission life.
AMSOIL Premium Protection Synthetic Motor Oil is specifically formulated to overcome the thermal deficiencies common to conventional petroleum oils. Volatilization (burn-off), oxidation and excessive deposit formation from high heat are greatly reduced. Viscosity thickening is controlled and engines run cleaner, promoting cooler operation and long engine life in air or liquid-cooled engines. In addition, the higher viscosity nature of AMSOIL 20W-50 Synthetic Motor Oil may help reduce motor oil consumption in equipment that experiences higher-than-normal usage rates when lower-viscosity lubricants are installed.
Superior AMSOIL synthetic base stock and additive technology exceeds the requirements of both gasoline and diesel engines. AMSOIL Premium Protection Motor Oil is designed to neutralize acids, disperse soot and last longer in service than conventional oils.
AMSOIL Synthetic 20W-50 Premium Protection Motor Oil is compatible with conventional and synthetic motor oils. Mixing AMSOIL motor oils with other oils, however, will shorten the oil life expectancy and reduce the performance benefits. AMSOIL does not support extended drain intervals where oils have been mixed. Aftermarket oil additives are not recommended for use with AMSOIL Synthetic Oils.
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 or one year, whichever comes first, or longer based on oil analysis.
•Severe Service - Up to 15,000 miles or one year, whichever comes first, or longer based on oil analysis.
Gasoline Engine Service
•Normal and Severe Service - Up to 15,000 miles or one year, whichever comes first, or longer based on oil analysis.
Motorcycles, Small Engines, Stationary Engines, Heavy Equipment and Other Applications
•Extend drain intervals based on oil analysis or follow the manufacturer-recommended drain interval.
AMSOIL Ea Full-Flow Oil Filters are designed for extended drain intervals. They stop smaller particles, flow more oil and last longer than regular filters. For best performance, use AMSOIL Ea Full-Flow Oil Filters and replace at the time of oil change. Other oil filters should be changed at standard OEM* intervals.
*OEM - Original Equipment Manufacturer
This product is not expected to cause health concerns when used for the intended application and according to the recommendations in the Material Safety Data Sheet (MSDS).
Click here to view the MSDS Data Sheet for AMSOIL ARO.
Keep out of the reach of children. Don't pollute. Return used oil to collection centers.
| TYPICAL PHYSICAL PROPERTIES | |
| AMSOIL High Performance Synthetic 20W-50 Motor Oil (ARO) | |
| Kinematic Viscosity @ 100°C, cSt (ASTM D-445) | 18.9 |
| Kinematic Viscosity @ 40°C, cSt (ASTM D-445) | 123.8 |
| Viscosity Index (ASTM D-2270) | 172 |
| CCS Viscosity @ -15°C, cP (ASTM D-5293) | 3525 (-15) |
| Pour Point °C (°F) (ASTM D 97) | -36 (-33) |
| Flash Point °C (°F) (ASTM D 92) | 233 (451) |
| Fire Point °C (°F) (ASTM D-92) | 249 (480) |
| High Temperature/High Shear @ 150°C and 1.0 X 106 s-1, cP(ASTM D 4683), cP | 5.0 |
| Four Ball Wear Test (ASTM D 4172 @ 40 kgf, 150°C, 1800 rpm, 1 hour, Scarin mm) | 0.40 |
| Noack Volatility, % weight loss (g/100g) (DIN 51581) | 6.5 |
| Total Base Number | 12.1 |
Product Name: Premium Protection Motor Oils (AMO,ARO)
Current Rating: 4.94out of 5 stars
Votes & Reviews: 33 vote(s) and 44 user reviews.
Reviewed by James: 
Purchased for use in an inboard v 6 boat engine. Great oil for this application.
Reviewed by Cecil:
Great product
Reviewed by Richard:
Love this oil, the full synthetic oil I was using can not even hold a candle to AMSOIL. The engine runs so smooth and much more quietly : )
I also went from a 5w30 to the 10w40 for the summer, will change back to the 5w30 for the winter.
When I'm ready for a transmission fluid change I'm changing over to AMSOIL too.
Richard
Reviewed by Joey:
Bought this oil for our 2015 Scag Cheetah, so far it's amazing, it seems to run way better, and for some reason it doesn't pop anymore when starting it. It has a 31 hr Kawasaki motor . Our dealer told us to use 20 w50 in it, now I gotta cross reference the oil filter and order some.
Reviewed by Adam:
Product does wonders in the evo. The turbo requires high zinc so this does the job.
Reviewed by Shawn:
This Amsoil Motor Oil is used in a track car that constantly see's high RPM pulls on a road race course. Works well and oil temps seem to stay steady throughout a 20-30 minute session. Am pleased with the product and will continue to use it. It's what I would call "cheap insurance".
Reviewed by Thor:
The Amsoil high zinc formula is all i use in my bbc. This oil holds up to the heat and high compression of my street/strip motor.
Reviewed by George:
I will continue to purchase nothing but AMSOIL for all our lubrication needs. Classic cars, snowmobiles, 4 wheelers, and our daily drivers. Gas and diesel. And dont forget the boats. It's one place for everything, shipped to my door.
Reviewed by Hilton:
Dad wanted an upgraded oil in his new F250 and I knew this company produces the best oil and I also run this in my Dixie chopper.
Canada
United States
Have used this product for years
Porsche 911 air cooled