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AMSOIL 5W-30 Signature Series 100% Synthetic Our best selling product

Our best selling product! If you want to use the next step up, try the AMSOIL 0W30 TSOSAE 5W-30 Signature Series Synthetic Motor Oil (ASL)
AMSOIL 100% Synthetic 5W-30 Motor Oil (ASL) delivers phenomenal and extraordinary lubrication in all types of automotive gasoline engines. By combining the industry premier synthetic technology with legendary AMSOIL developed premium additives, AMSOIL ASL exceeds the higher performance demands of modern engines.

I like to say AMSOIL's 5W-30 Signature Series nets your driving 'Experience to Extremes'. From the daily commute, the work truck or to hard core performance street driving our customers are very pleased with the difference it makes!

Printable and downloadable PDF Product Data Sheet


Package sizes include:
1-Quart Bottle
1-Quart Bottles (case of 12)
1-Gallon Bottle
1-Gallon Bottles (case of 4)
30-Gallon Drum
55-Gallon Drum

Call 800-579-0580 for wholesale pricing or to order via phone.

Nothing is held back in the additive blend for this and other Signature Series products. This is why it's the best in the industry. I'll quote AMSOIL's Vice President Dean Alexander, "When selecting additives and base stocks we are the only company who avoids making decisions based on cost. If there is a better product or a trend for something better AMSOIL is known in our industry to be the first to get it to the consumer with our legendary blending experience. That is our business, the business of being the best, not turning profits for share holders."
Note: You can also see this technique being used in the filters.

Buy Amsoil Signature Series 100% Synthetic 5W30 "ASL" In the Online Store Now


Look up your vehicle's filters, capacities, plugs, wires, wipers and Transmission/Drivetrain Fluids.

New!! 5W30 Comparison study with several other brands
A Study of SAE 5W30 Synthetic Oils

Would you like to know the oil which we suggest over this 5W30? That would be AMSOIL's Signature Series 0W30. It's the ultimate replacement. More power to the wheels, better start-up protection with out any compromises.


AMSOIL, the leader in automotive synthetic lubrication, produced the world’s first API qualified synthetic motor oil in 1972. Trust the extensive experience of AMSOIL The First in Synthetics® to do the best job protecting your engine.

Print our color product Data Sheet on the AMSOIL 5W30 ASL 100% Synthetic

Extends Drain Intervals
AMSOIL Signature Series Synthetic Motor Oil can extend drain intervals far beyond those recommended for conventional oils. Its unique synthetic formulation and long-drain additive system are inherently stable to resist oxidation and neutralize acids over longer periods. Signature Series Synthetic Motor Oil is designed to deliver the best possible engine protection, cleanliness and performance over extended drain intervals. It reduces vehicle maintenance and waste oil disposal costs.

Maximizes Fuel Economy
AMSOIL Signature Series Synthetic Motor Oil is designed to maximize energy efficiency for improved fuel economy. Unlike conventional oils, its uniform molecular structure helps it flow more freely and reduce friction between metal surfaces. Anti-friction additives are included to further improve energy efficiency.

Reduces Engine Wear
Signature Series Synthetic Motor Oil provides outstanding anti-wear protection. It has excellent viscosity film strength to separate metal surfaces and robust anti-wear additives to further reduce wear in metal-to-metal contact regions for improved engine life.

Reduces Oil Consumption and Emissions
Volatility (burn-off) occurs when oil gets hot, causing high oil consumption and emissions. AMSOIL Signature Series Synthetic Motor Oil exhibits an extremely low volatility rate; it controls volatility-related oil consumption and emissions.

Excels in Extreme Temperatures
AMSOIL Signature Series Synthetic Motor Oil resists thermal (heat) breakdown better than conventional oils. It is heavily fortified with detergent and dispersant additives to help prevent sludge deposits and keep engines clean. And unlike conventional oils, Signature Series Synthetic Motor Oil contains no wax, staying fluid in the coldest winter temperatures for easier starting, improved oil flow and reduced bearing wear. It stays fluid down to -60°F for improved cold temperature oil flow, reduced bearing wear and easier starting (see chart below). AMSOIL 5W-30 remains fluid at temperatures as frigid as -60°F (-51°C). It permits easy engine cranking for fast starts and in sub-zero temperatures flows to all engine parts much faster than petroleum motor oils. The exceptional cold temperature properties of AMSOIL 5W-30 provide immediate cold start lubrication, greatly reducing engine wear and prolonging engine life

AMSOIL Signature Series Synthetic Motor Oil is excellent for use in all types of gasoline-fueled vehicles. It is recommended for all domestic and foreign vehicles requiring any of the listed performance specifications:

5W-30 (ASL): API SN (Resource Conserving), SM…; ILSAC GF-5, GF-4…; ACEA A5/B5, A1/B1; Ford WSS-M2C946-A, WSS-M2C929-A; Chrysler MS-6395; GM dexos1™ (supersedes LL-A-025, 6094M and 4718M) Fortified with detergents that exceed dexos1™ sulfated ash specifications.

AMSOIL Signature Series Synthetic Motor Oil is compatible with other conventional and synthetic motor oils. Mixing AMSOIL motor oils with other oils, however, will shorten the oil’s life expectancy and reduce the performance benefits. AMSOIL does not support extended drain intervals where oils have been mixed. Aftermarket oil additives are not recommended for use with AMSOIL synthetic motor oils.

AMSOIL Signature Series Synthetic Motor Oil is recommended for extended drain intervals in unmodified(1), mechanically sound(2) gasoline-fueled vehicles as follows:


• Normal Service(3) – Up to 25,000 miles or one year, whichever comes first.
• Severe Service(4) – Up to 15,000 miles or one year, whichever comes first.
• In all non-gasoline-fueled vehicle applications, extend the oil change interval according to oil analysis or follow the OEM* drain interval.

*OEM – Original Equipment Manufacturer

(1) Engines operating under modified conditions (non-stock) are excluded from extended drain recommendations. Examples include the use of performance computer chips; non-OEM approved exhaust, fuel or air induction systems; and the use of fuels other than those recommended for normal operation by the manufacturer.

(2) Mechanically sound engines are in good working condition and do not, for example, leak or consume excessive amounts of oil, are not worn out, do not overheat, do not leak antifreeze and have properly working emissions control systems. AMSOIL recommends repairing malfunctioning engines prior to the installation of AMSOIL synthetic oils.

(3) Personal vehicles frequently traveling greater than 10 miles (16 km) at a time and not operating under severe service.

(4) Turbo/supercharged engines, commercial or fleet vehicles, excessive idling, vehicles with more than 100,000 miles without prior continuous use of AMSOIL motor oil, daily short-trip driving less than 10 miles (16 km), frequent towing, plowing, hauling or dusty condition driving.

AMSOIL Ea® Full-Flow Oil Filters are designed for extended change intervals. They stop smaller particles, flow more oil and last longer than regular filters. For best performance, use AMSOIL Ea Full-Flow Oil Filters.

This product is not expected to cause health concerns when used for the intended application and according to the recommendations in the Material Safety Data Sheet (MSDS). An MSDS is available via the Internet at or upon request at (715) 392-7101. Keep Out of Reach of Children. Don’t pollute. Return used oil to collection centers.

For warranty information, visit

Resists High Temperature Vaporization
AMSOIL Synthetic 5W-30 Motor Oil resists vaporizing in the high temperatures that vaporize petroleum motor oils. AMSOIL 5W-30 remains a 5W-30, providing consistent high temperature protection.

Our best competitors can't come even close to our viscosity retention.

Provides High Shear Stability
AMSOIL 5W-30 surpasses the North American SAE and European ACEA oil specifications for high temperature/high shear (HTHS) viscosity. It doesn't shear back to a lower viscosity oil in the high temperature/high shear conditions of today's smaller, high RPM automobile engines. AMSOIL 5W-30 maintains an extremely protective viscosity of 3.5 cP at 302°F (150°C) in the ASTM D-4683 High Temperature/High Shear Test, far exceeding test limits of 2.9 cP..

See complete up to date details on the AMSOIL Synthetic 5W30 motor oil (PDF) with this printable data sheet.



 AMSOIL 100% Synthetic Signature Series 5W-30 Motor Oil (ASL)

Kinematic Viscosity @ 100°C, cSt (ASTM D-445)


Kinematic Viscosity @ 40°C, cSt (ASTM D-445)


Viscosity Index (ASTM D-2270)


CCS Viscosity @ -25°C, cP (ASTM D 2602)

44.26 (-30)

Fire Point °C (°F) (ASTM D-92)

248 (478)

Pour Point °C (°F) (ASTM D 97)

-51 (-60)

Flash Point °C (°F) (ASTM D 92)

226 (439)

Four Ball Wear Test (ASTM D-4172 B: 40 kg, 75°C, 1200 rpm, 1 hour, Scar in mm)


Noack Volatility, % weight loss (g/100g) (ASTM D-5800)


High Temperature/High Shear Viscosity cP, 150°C, 1.0 X 106 s.-1, (ASTM D 4683),


Total Base Number


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Even better call if you would like us to email you the confidential wholesale price list so you can see EVERYTHING AMSOIL sells, then you know the pricing on all the products when you call. 800-579-0580 and ask for the price list.

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One point I use often is that as oils "in general" get better - new problems arise as well. We hear of sludging and deposits still today. Actually even more today as new technologies to reduce emmissions are creating more heat which increases loads on the lubricant. Challenges are always changing the industry. Nothing in the past applies today but todays oils WILL proide more outstanding protection in older vehicles.

Keeping Engines Clean with AMSOIL

Though conventional motor oil quality has improved over the past 30 years, this progress is also offset by emission-reduction strategies, including variable valve timing (VVT), which strangles the engine a little tighter and makes it run hotter.

The average motorist has never even heard of variable valve timing, but it’s a critical component in the operation of a vehicle. Almost every vehicle manufacturer has published a bulletin stating that the numberone cause of variable-valve-timing system problems is small amounts of residue and sludge. In other words, cleanliness is absolutely essential.

In the old days, the engine’s intake and exhaust valves were set to open and shut at specific points in the fourstroke cycle for a set amount of time. With variable valve timing, engines can adjust the timing for when and how long these valves open and shut by relying on a combination of sensors and mechanical systems, many critically located on the camshaft and crankshaft. When these components get gummed-up with sludge or deposits, it can lead to poor performance and costly repair bills.

Because AMSOIL synthetic motor oil resists oxidation and breakdown in high heat, it is less prone to produce the varnish and sludge that damages these critical sensors.

Keeping engines clean by using AMSOIL synthetic motor oils helps them last longer. Cleanliness reduces wear, ring sticking and emissions while helping ensure all these components operate as designed.


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