PRODUCT GUIDANCE / MOTOR OIL
Find the Right AMSOIL Synthetic Motor Oil for Your Vehicle
Know your required oil grade? Review the current Signature Series results below, then check available sizes and pricing at AMSOIL. If you are unsure which oil fits, start with the vehicle lookup before ordering.
SyntheticOilHQ is an independent AMSOIL dealer, number 313120. Purchases take place on AMSOIL's website. Select 10W-30 only when it meets your vehicle's requirements.
Results below cover different Signature Series grades. Each graphic identifies the grade and test conditions. They provide product evidence, not current head-to-head rankings against other brands.
Oil life: heat, deposits and service conditions
Start with the specifications in your owner's manual and the service conditions for the oil you select. Laboratory results help explain a product's performance; the service instructions determine its recommended change interval.
AMSOIL's June 2026 data sheet reports 72% more protection against piston deposits than the industry requirement in Sequence IIIH testing of Signature Series 5W-30. It also reports 31% better protection than required after a double-length test.
Reproduced with the permission of AMSOIL INC. All rights reserved.
Review the full service limits below before choosing an extended oil-change interval.
Oil consumption: compare NOACK volatility
The NOACK test measures evaporation loss under specified high-temperature conditions. AMSOIL's current chart shows a 7.2% result for Signature Series 0W-20 against a 15% maximum industry limit.
Reproduced with the permission of AMSOIL INC. All rights reserved.
For Signature Series 10W-30, the same data sheet lists a typical NOACK result of 3.9%. Keep the grade attached to each result when comparing products.
Cold weather: understand pour point
The June 2026 sheet lists a typical pour point of -48°C (-54°F) for Signature Series 10W-30 under ASTM D97. Pour point describes laboratory flow behavior; it is not a guaranteed engine-starting temperature.
Use your vehicle's specified viscosity and application requirements when selecting oil for cold weather. Check the oil grade for your vehicle.
Acid control: understand total base number
AMSOIL lists a typical total base number of 10.4 for Signature Series 10W-30 using ASTM D2896. Total base number measures alkaline reserve used to neutralize acids.
A starting TBN value alone does not establish how long oil can remain in your engine. Use the product's complete service instructions rather than a single test result to set the change interval.
Cold starts: compare cranking viscosity
Signature Series 10W-30 has a listed typical cold-cranking viscosity of 3,917 cP at -25°C using ASTM D5293. Compare values measured at the same temperature and for the relevant viscosity grade.
The data sheet describes these as typical properties, not manufacturing specifications, and notes that formulations can change. Read the current Signature Series data sheet before making your final selection.
Engine protection: examine the test conditions
AMSOIL tested Signature Series 5W-30 in a 2025 Ford F-150 Raptor over 125,000 miles, changing the oil at 25,000-mile intervals. Its chart compares horsepower and torque at the start and end of that study.
Reproduced with the permission of AMSOIL INC. All rights reserved.
This is a vehicle performance-retention study. It does not establish a ranking against other oils or predict the lifespan of your engine.
All trademarked names and images are the property of their respective owners and may be registered marks in some countries. No affiliation or endorsement claim, express or implied, is made by their use.
Ownership cost: use your actual service schedule
Compare the amount of oil your engine needs, the correct filter, labor and the number of oil changes required for your use. Check current prices in the AMSOIL store when you are ready to order.
| Service | Maximum interval, whichever comes first |
|---|---|
| Normal service | 25,000 miles, 700 operating hours or one year |
| Severe service | 15,000 miles, 700 operating hours or one year |
Severe service includes commercial or fleet use, excessive idling, or frequent towing, hauling, plowing or driving in dusty conditions. Modified engines, racing vehicles and vehicles using alternative fuels such as E85, CNG or propane are excluded from extended-drain recommendations.
Outside the U.S. and Canada, follow the vehicle manufacturer's drain interval. With other-brand filters, do not exceed 12,000 miles or one year unless the vehicle manufacturer recommends longer intervals. Always change the filter when changing oil and check the oil level regularly. AMSOIL does not support extended drain intervals when its oil is mixed with other oils.
Confirm the fit, then order from AMSOIL.
Source: AMSOIL Signature Series Data Sheet G2880, June 2026; public AMSOIL product graphics checked October 24, 2026. View the manufacturer data sheet. Reproduced with the permission of AMSOIL INC. All rights reserved.