AMSOIL High Performance Synthetic 10W-40 Motor Oil provides superior protection and performance in the most sever automotive driving conditions. AMSOIL High Performance Synthetic 10W-40 Motor Oil provides a wide range of protection in all four-cycle gasoline and diesel engines, including pickups, RVs, cars and off-highway vehicles. It is recommended for use in vehicles subject to stop-and-go driving, short trips, high temperatures, frequent trailer pulling and off-road use.

Mixing AMSOIL

AMSOIL High Performance Synthetic 10W-40 Motor Oil is compatible with conventional petroleum oils; however, mixing AMSOIL 10W-40 with a conventional oil will shorten the drain period of AMSOIL 10W-40. Engine oil additives or after-market products are not recommended for use with AMSOIL 10W-40.

New Vehicle Under Warranty

AMSOIL High Performance Synthetic 10W-40 Motor Oil will not void new vehicle warranties. New vehicle warranties are based on the use of oils meeting specific API service classifications and SAE viscosity grades. AMSOIL High Performance Synthetic 10W-40 Motor Oil meets the current API and SAE requirements (as labeled) and is perfectly situated for use in any new vehicle stipulating those requirements in its owner's manual.

Service Life

• In personal cars and light-duty trucks with non-turbocharged gasoline engines, drain oil at 25,000 miles or one-year intervals, whichever comes first.
• In turbocharged gasoline engines, change oil at three times the engine manufacturer's recommended drain interval or six months, whichever comes first.
• In high performance and racing engines, change oil at intervals specified by used oil analysis.
• In light-duty and non-turbocharged diesel engines, change oil at two or more times the engine manufacturer's recommended drain intervals if the findings of used oil analysis support those drain intervals or six months, whichever comes first.
• In heavy duty and turbocharged diesel engines, change oil at two or more times the engine manufacturer's recommended drain intervals if the findings of used oil analysis support those drain intervals or six months, whichever comes first.
• In marine craft and occasionally used gasoline engines, change oil at three times the engine manufacturer's recommended drain interval or one year, whichever comes first.
• In fleet vehicles and industrial gasoline engines, change oil at three times the engine manufacturer's recommended drain interval or six months, whichever comes first.

If the vehicle is equipped with an AMSOIL Oil Filter, the filter should be changed at 12,500-mile or six-month intervals (whichever comes first) in gasoline engines. Non-AMSOIL oil filters should be changed at the engine manufacturer's recommended filter change interval.