AMSOIL Oil Change Interval

How long does AMSOIL last? AMSOIL® Signature Series 100% Synthetic Motor Oil is guaranteed to protect for up to 25,000 miles (40,200 km) or one year in normal service, and up to 15,000 miles (24,140 km) or one year in severe service. Other AMSOIL motor oils have their own intervals, listed by product line below. Generally speaking, AMSOIL synthetic motor oil outperforms other conventional and synthetic oils and performs so well you can extend oil change intervals if you want. Extending oil change intervals provides the following benefits:

• Reduced maintenance
• Reduced annual oil costs
• Less waste oil disposal

If you choose to follow the oil change interval given in your owner’s manual, AMSOIL synthetic motor oil still provides long-life wear protection, fights sludge and carbon buildup, and resists volatility to help reduce oil consumption and top-offs. Weighing AMSOIL against another oil? Here’s how to compare synthetic motor oils.

AMSOIL oil change interval by product line

Signature Series Synthetic Motor Oil

• Normal Service – Up to 25,000 miles (40,200 km), 700 hours of operation or one year, whichever comes first, in personal vehicles not operating under severe service.
• Severe Service – Up to 15,000 miles (24,140 km), 700 hours of operation or one year, whichever comes first. Severe service conditions include commercial or fleet vehicles; excessive idling; or frequent towing, hauling, plowing or driving in dusty conditions.
• AMSOIL Oil Filters are designed for extended drain intervals. With other brand filters, do not exceed 12,000 miles (19,312 km) or one year unless the vehicle manufacturer recommends a longer interval.
• Modified (non-stock) engines, racing vehicles and vehicles using alternative fuels (E85, CNG, propane, etc.) are excluded from extended drain interval recommendations. Outside the U.S. and Canada, change oil at the vehicle manufacturer’s recommended interval.

Extended-Life Synthetic Motor Oil

• Normal Service — Up to 20,000 miles (32,000 km) or one year, whichever comes first, in personal vehicles not operating under severe service.
• Severe Service — Up to 12,000 miles (20,000 km) or one year, whichever comes first. Severe service conditions include commercial or fleet vehicles; excessive idling; or frequent towing, hauling, plowing or driving in dusty conditions.
• AMSOIL Oil Filters are designed for extended drain intervals. With other brand filters, do not exceed 12,000 miles (20,000 km) or one year.

OE Synthetic Motor Oil

• Recommended for the intervals stated by the vehicle manufacturer or indicated by the oil life monitoring system.

Signature Series Max-Duty Synthetic Diesel Oil Diesel Engine Service Life

• Heavy-Duty On-/Off-Road: Three times (3X) OEM¹ recommendation, not to exceed 60,000 miles/600 hours or one year, whichever comes first.
• Turbodiesel Pickup: Two times (2X) OEM¹ recommendation, not to exceed 25,000 miles or one year, whichever comes first.
• Competition Service Life: Provides lasting protection for multiple events. Use oil analysis to determine appropriate drain intervals.

Gasoline Engine Service Life

• Two times (2X) OEM¹ recommendation, not to exceed 15,000 miles or one year, whichever comes first.

Drain intervals may be extended further with oil analysis. Extended drain intervals are not recommended for performance-modified engines, when using biofuels containing more than 10 percent ethanol or 15 percent biodiesel (B15), or for 2007-2009 Caterpillar* C13 and C15 on-highway engines. In those cases, extend beyond OEM recommendations only with oil analysis. 2007-2010 Dodge*, Ford* and GM* turbodiesel pickups are also not recommended for extended drain intervals with Signature Series Max-Duty 5W-30 Diesel Oil. Heavy-Duty Synthetic Diesel Oil

• Recommended for the drain intervals stated by the original equipment manufacturer (OEM).

Synthetic Diesel Oil

• Recommended for the drain intervals stated by the original equipment manufacturer (OEM).

AMSOIL Synthetic V-Twin Motorcycle Oil, Synthetic ATV/UTV Motor Oil, Synthetic Dirt Bike Oil and other oils are recommended for the oil change intervals stated by the OEM. See their respective product pages on AMSOIL.com for details about oil change intervals. Whether you change oil according to OEM guidelines or extend oil change intervals, be sure to change the oil filter at every oil change. You can also extend oil change intervals further with oil analysis.

Oil change interval history

Not long ago, it was common to change conventional oil every 3,000 miles/3 months. The practice originated in the 1960s to time oil changes with the seasons. The quick lube market picked up the idea to keep traffic flowing, touting it as an “insurance policy” for your engine. Improvements in motor oil performance and engine technology have since rendered that guideline outdated. The advent of electronic oil life monitors struck a first blow. GM introduced its system in 1988, and it’s now on tens of millions of vehicles. In the early 2010s, the state of California aggressively campaigned against changing oil every 3,000 miles, calling it wasteful. The final stake in the heart of the 3,000-mile oil change came in 2011 when the largest quick-lube chain abandoned the practice, advising motorists to follow the guidelines in their vehicle’s owner’s manual.

Synthetics provide longer oil change intervals

While synthetic oil lasts longer than conventional oil, it can be difficult to define precisely how much longer it lasts, depending on the brand. Most oil manufacturers don’t recommend a service interval for their products. They generally advise you to follow the oil-change recommendation in your vehicle’s owner’s manual, likely due to most motorists’ unwillingness to go longer between oil changes than what’s recommended. But some synthetic oils, such as AMSOIL extended-drain synthetic motor oils, provide a guaranteed oil change interval that allows you to go longer between oil changes if you choose. For some, this provides peace of mind should maintenance be delayed. For others, it offers the convenience and savings of a once-a-year or twice-a-year oil change. Whether you want to extend oil change intervals or just use the best oil possible, AMSOIL offers a synthetic oil to suit your needs.

Oil change interval FAQ

¹ Refer to your owner’s manual for OEM drain interval recommendations and guidelines for severe and normal service.