AMSOIL 20W-50 Premium Protection is a fully synthetic, high-viscosity engine oil formulated to provide superior protection and performance in demanding applications. It’s ideal for high-mileage and high-stress vehicles exposed to hot temperatures, heavy hauling, trailer pulling or off-road use, and it provides the extra anti-wear protection often required by engines with flat-tappet cams and high-tension valve springs. It contains no friction modifiers, making it suitable for wet-clutch applications.
Key Benefits
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High-zinc formula guards against wear
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Ideal for flat-tappet cams
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Resists deposits to help keep engines clean
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Convenience of use for gasoline and diesel engines
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Wet-clutch compatible (no friction modifiers) to help prevent clutch glazing and slippage
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Resists oxidation and high-temperature breakdown; helps control viscosity thickening
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Higher viscosity may help reduce oil consumption in equipment that experiences higher-than-normal usage rates with lower-viscosity lubricants installed
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Designed to neutralize acids, disperse soot and last longer in service than conventional oils
Applications (Specifications / Approvals)
Recommended for air- and liquid-cooled, large or small gasoline and diesel engines, transmissions and chaincase applications where 20W-50 oils are required with any of the following specifications:
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API SL, SJ, SH, SG
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API CI-4+, CI-4, CH-4, CF, CF-2
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ISO-L-EMA
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Caterpillar ECF-1
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JASO MA (Motorcycle)
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MAN 271/3275
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MTU Type 2
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Cummins 20071/20072/20076/20077
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Volvo VDS-2, VDS
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Mack EO-M+, EO-M
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ACEA A3/B3, E3, E5
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MB 228.1, 228.3, 229.1
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Detroit Diesel 93K214
Change / Drain Interval (Service Life)
AMSOIL Premium Protection 20W-50 is recommended for extended intervals in unmodified, mechanically sound vehicles or equipment as follows:
Diesel engine service
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Normal service: Up to 25,000 miles or 1 year, whichever comes first, or longer based on oil analysis
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Severe service: Up to 15,000 miles or 1 year, whichever comes first, or longer based on oil analysis
Gasoline engine service
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Normal and severe service: Up to 15,000 miles or 1 year, whichever comes first, or longer based on oil analysis
Motorcycles, small engines, stationary engines, heavy equipment and other applications
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Extend drain intervals based on oil analysis or follow the manufacturer-recommended drain interval
Oil filter
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Replace at the time of oil change (other-brand oil filters should be changed at standard OEM intervals)
Note: Always confirm the required viscosity and specifications in your vehicle owner’s manual before use.
