Frequently Asked Questions About AMSOIL

AMSOIL uses premium synthetic base stocks and advanced additive packages that cost more to produce than conventional or lower-tier synthetic oils. You're paying for extended drain intervals (up to 25,000 miles), superior wear protection (75% more than required by industry standards), and reduced long-term maintenance costs. Per mile driven, AMSOIL often costs less than cheaper oils changed at 3,000 to 5,000 mile intervals.

AMSOIL has been formulating synthetic lubricants since 1972, one of the longest track records in the industry in 1972, and it consistently outperforms competitors in independent testing for wear protection, oxidation resistance, cold-pour point, and deposit control. Whether it's 'the best' depends on your priorities, but AMSOIL leads in nearly every measurable performance category.

AMSOIL outperforms Mobil 1 in key areas including wear protection (75% more than required by industry standards), oxidation resistance, and drain interval capability. AMSOIL Signature Series protects for up to 25,000 miles or 1 year, while most Mobil 1 products recommend 10,000 to mile intervals.

Both are quality synthetics, but AMSOIL offers significantly longer drain intervals and independently verified wear protection performance. Pennzoil Platinum uses natural-gas-derived base oils (PurePlus Technology) and typically recommends standard OEM drain intervals. AMSOIL Signature Series extends to 25,000 miles and delivers independently verified wear protection performance.

Royal Purple is a quality synthetic oil, but AMSOIL provides longer drain intervals and more extensive product testing data. AMSOIL publishes detailed independent test results showing its performance against industry benchmarks. Royal Purple recommends standard drain intervals, while AMSOIL Signature Series extends to 25,000 miles.

Castrol Edge uses Fluid Titanium Technology and is a solid synthetic oil for OEM drain intervals. AMSOIL Signature Series offers longer drain intervals (25,000 miles vs. standard intervals), better cold-flow properties, and independently verified wear protection performance. For drivers seeking maximum protection and extended service, AMSOIL is the stronger choice.

OE matches your vehicle manufacturer's recommended drain interval, great for warranty compliance and budget-conscious drivers. XL extends to 12,000 miles or 1 year, offering a step up in protection and value. Signature Series is AMSOIL's best, 25,000-mile or 1-year intervals with 75% more wear protection than the industry's toughest standard.

The 'W' stands for 'Winter.' The number before the W (5W) indicates the oil's viscosity at cold temperatures, lower numbers flow better in cold weather. The number after (30) indicates viscosity at operating temperature. A 5W-30 oil flows well in cold starts and maintains proper thickness when your engine is hot.

Dominator is AMSOIL's competition-grade synthetic racing oil. It's formulated with extra anti-wear additives for engines operating under extreme RPM, heat, and stress, such as drag racing, road racing, and high-performance track applications. It is not recommended for everyday street driving.

Conventional oil is refined from crude petroleum and contains irregular molecules and impurities. Synthetic oil is chemically engineered with uniform molecules, providing better wear protection, thermal stability, cold-flow properties, and extended drain intervals. AMSOIL synthetic oils outperform conventional oils in every measurable performance category.

AMSOIL uses a proprietary blend of premium additives including anti-wear agents (zinc/phosphorus compounds), detergents, dispersants, friction modifiers, viscosity index improvers, antioxidants, and corrosion inhibitors. The exact formulation varies by product line and is calibrated for specific performance targets.

Yes. AMSOIL has been formulating synthetic lubricants since 1972, one of the longest track records in the industry (1972). AMSOIL products carry API certifications including API SP, SN Plus, and CK-4 for diesel applications. They also meet ILSAC GF-6A/6B standards.

Yes. AMSOIL products meet or exceed specifications from GM (dexos1 Gen 3), Ford (WSS-M2C946-B1, WSS-M2C962-A1), Chrysler (MS-6395, MS-10902), BMW, Mercedes-Benz, Volkswagen, and many others. Use the AMSOIL Vehicle Lookup tool to confirm the right product for your vehicle.

Absolutely. As long as the AMSOIL product meets your vehicle manufacturer's required oil specification (which it almost certainly does), your warranty is fully protected. The Magnuson-Moss Warranty Act prohibits manufacturers from voiding your warranty for using aftermarket products that meet their specifications.

Yes. AMSOIL backs its products with a Limited Warranty guaranteeing they will perform as advertised when used according to AMSOIL recommendations. For complete warranty terms and coverage details, visit the official warranty page at amsoil.com/about/guarantee/.

Simply drain your old oil, replace the filter, and fill with the appropriate AMSOIL product. No special procedure is needed. If your engine has high mileage or a history of infrequent oil changes, consider using AMSOIL Engine and Transmission Flush first to remove accumulated deposits.

It's not required, but it's recommended for engines with unknown maintenance history or heavy deposit buildup. AMSOIL Engine and Transmission Flush is a fast, safe way to clean your engine before filling with AMSOIL. For well-maintained engines, a standard drain and fill is sufficient.

AMSOIL recommends following your vehicle manufacturer's break-in procedure and oil recommendation for the initial break-in period (typically 0 to 1,000 miles or the first oil change). After the manufacturer-recommended break-in, you can switch to AMSOIL.

No. This is a common myth about synthetic oils. AMSOIL synthetic motor oils will not cause leaks in a healthy engine. If an engine has pre-existing seal damage or worn gaskets, any oil, synthetic or conventional, may expose those issues. AMSOIL High-Mileage oil actually includes seal conditioners to help prevent leaks in older engines.

Yes, in many cases. AMSOIL's superior resistance to evaporation (volatility) means less oil is burned off during normal operation. AMSOIL Signature Series has extremely low NOACK volatility, meaning it resists burn-off better than most competing oils. For high-mileage engines, AMSOIL High-Mileage oil includes seal conditioners that can further reduce consumption.

Yes. AMSOIL is one of the most popular oil choices among Harley-Davidson riders. AMSOIL V-Twin 20W-50 Synthetic Motor Oil is specifically formulated for air-cooled V-Twin engines and provides outstanding protection against heat, wear, and compensator noise. AMSOIL also makes dedicated V-Twin Transmission Fluid and Primary Fluid.

AMSOIL offers dedicated synthetic oils for ATVs, UTVs, and side-by-sides. The AMSOIL Synthetic ATV/UTV Motor Oil is designed for the extreme demands of off-road powersports including high heat, heavy loads, and dusty conditions. Check the AMSOIL Vehicle Lookup tool for your specific make and model.

Yes. AMSOIL offers a High-Mileage Synthetic Motor Oil specifically formulated for engines with over 75,000 miles. It includes seal conditioners that rejuvenate aging seals to reduce oil consumption and leaks, along with extra detergents to clean accumulated deposits.

Turbocharged engines benefit greatly from AMSOIL Signature Series, which provides outstanding turbocharger deposit control and thermal stability at the extreme temperatures turbo bearings experience (up to 400°F+). AMSOIL protects against Low-Speed Pre-Ignition (LSPI), a critical concern for modern turbocharged direct-injection engines.

Yes. AMSOIL Signature Series is engineered and tested to provide protection for up to 25,000 miles or 1 year under normal driving conditions. AMSOIL backs this claim with extensive testing including the industry's most demanding wear, oxidation, and deposit tests. For severe-service driving, 15,000 miles is recommended.

Yes. AMSOIL Signature Series is designed for up to 25,000 miles OR 1 year, whichever comes first. Even if you don't drive 25,000 miles in a year, the oil's advanced antioxidant package protects against moisture and acid buildup during extended service periods.

Yes. You can follow your vehicle's oil life monitor when using AMSOIL OE Synthetic. For Signature Series and XL, AMSOIL's extended drain recommendations often exceed what the oil life monitor indicates, because the monitor was calibrated for conventional oil. You can safely follow AMSOIL's published drain interval recommendations.

Severe service includes: frequent short trips (under 10 miles), stop-and-go traffic, towing or hauling heavy loads, dusty or dirty conditions, extreme hot or cold temperatures, and sustained high-RPM operation. Under severe service, AMSOIL recommends 15,000-mile intervals for Signature Series and proportionally shorter intervals for XL and OE.

Click the 'Become a Preferred Customer' button on this site to register. You'll immediately unlock up to 25% savings on every order, free shipping on orders over $100, birthday coupons, and exclusive promotions. You can also call Eric Riley at (813) 563-2091 for assistance.

AMSOIL offers a 6-month trial membership and a full 1-year membership. Depending on your order size and how frequently you buy, the membership fee can easily pay for itself. Contact Eric Riley at (813) 563-2091 for current membership pricing so you can see if it makes sense for your buying habits.

To become an Independent AMSOIL Dealer, you register through an existing dealer (like Eric Riley) and purchase a dealer kit. Dealers earn commissions on sales, access wholesale pricing, and can build a business by servicing retail and commercial accounts. Contact Eric at (813) 563-2091 for details.

For people who use AMSOIL products and know others who do, a dealership can absolutely be worth it. You get the best pricing for personal use, earn commissions on every sale, and can service commercial accounts. It's especially valuable for mechanics, fleet managers, and automotive enthusiasts. Contact Eric Riley to learn more.

Yes. AMSOIL INC. has been in business since 1972, over 50 years. It is a privately-held, American-owned company headquartered in Superior, Wisconsin. AMSOIL holds numerous API certifications, sponsors professional motorsports teams, and its products are used by military, commercial fleet, and industrial operations worldwide.

AMSOIL was founded in 1972 by Lt. Col. Albert J. Amatuzio, a fighter jet squadron commander who recognized that synthetic lubricants used in jet engines could benefit passenger vehicles. AMSOIL has been in continuous operation for over 50 years.

AMSOIL INC. formulates all of its own products and controls the blending process. AMSOIL owns and operates blending facilities and maintains strict quality control over every batch. Unlike many oil brands that rebrand third-party oil, AMSOIL develops its own proprietary formulations.

Some mechanics are unfamiliar with AMSOIL or associate it with its dealer network rather than its product quality. Others may prefer oils they can buy at local parts stores for convenience. In independent lab testing, AMSOIL consistently outperforms mainstream brands. Mechanics who have actually tested or used AMSOIL typically become loyal customers.

Yes. Eric Riley is an Independent AMSOIL Dealer serving the greater Tampa Bay area including Dade City, Zephyrhills, Wesley Chapel, Land O' Lakes, New Port Richey, and surrounding communities. Contact Eric at (813) 563-2091 or visit 1stsynthetic.com to order.

If you're in the Dade City, Pasco County, or Tampa Bay area of Florida, Eric Riley is your local Independent AMSOIL Dealer. For areas outside of Florida, contact Eric and he can help connect you with AMSOIL's dealer network or ship products directly to you.

Both options are available. You can order through Eric Riley's online dealer store for shipping directly to your door (standard shipping usually arrives in 3 to 5 business days, depending on distance), or contact Eric at (813) 563-2091 to arrange local pickup in the Dade City, Florida area.