Are synthetic AMSOIL motor oils 'all-season' oils?
Yes. Because AMSOIL synthetic motor oils are formulated with premium synthetic base oils, they provide superior high and low-temperature performance. Synthetic oils resist thinning out at high temperatures to maintain critical protection in extreme heat. They also minimize sludge and deposit formation in high-temperature operation. AMSOIL synthetic motor oils resist thickening in cold temperatures to provide rapid cold starts and improved low-temperature operation compared to conventional oils.
Why are there multiple oils of the same viscosity?
A significant portion of an oil's performance and specification compatibility comes from its additive components. AMSOIL offers multiple oils with the same viscosity because they are formulated with different additive packages that carry different manufacturer oil specifications. This allows AMSOIL to provide premium oil for more equipment manufacturers and industry specifications than would be possible if only a single viscosity grade was offered.
What are the differences between AMSOIL OE Synthetic Motor Oil, XL Synthetic Motor Oil and Signature Series Synthetic Motor Oil?
AMSOIL OE Synthetic Motor Oil is recommended for vehicle manufacturer-recommended oil change intervals; AMSOIL XL Synthetic Motor Oil is recommended for extended drain intervals of 12,000 miles or a year (whichever comes first) and AMSOIL Signature Series Synthetic Motor Oil is recommended for extended drain intervals of 25,000 miles or one year (whichever comes first). AMSOIL Signature Series Synthetic Motor Oil is formulated with better base oils and more robust additives, allowing longer extended drains than AMSOIL OE or XL Synthetic Motor Oils.
What kind of base stocks does AMSOIL use? Are AMSOIL synthetic lubricants PAO-based?
AMSOIL maintains formulation details as proprietary and does not divulge specifics regarding the type of synthetic base stocks used in its synthetic lubricants. AMSOIL developed the world’s first API-qualified synthetic motor oil in 1972 and has remained the leader in the synthetic lubricant industry by continually researching new technologies and demanding only the highest-quality raw materials. As the company moves forward with new technologies it is increasingly more important that this information remains proprietary. AMSOIL views synthetic base oils the same as it views additives, with each having its own set of unique properties. AMSOIL does not insist on a particular type of base stock, but insists on particular performance parameters. AMSOIL chooses whichever synthetic base stock or combination of base stocks delivers the desired result and tailors its lubricants to be application-specific (gasoline, diesel, racing, transmission, gear, extended drain, extreme temperatures, etc.). At the end of the day, the type of base stock used to formulate the oil is inconsequential; the product’s performance is what matters.

AMSOIL Gasoline Motor Oils

AMSOIL Signature Series 0W-20 Synthetic Motor Oil
Signature Series 0W-20 Synthetic Motor Oil
AMSOIL Signature Series 0W-40 Synthetic Motor Oil
Signature Series 0W-40 Synthetic Motor Oil
AMSOIL OE Signature Series 5W-20 Synthetic Motor Oil
Signature Series 5W-20 Synthetic Motor Oil
AMSOIL OE Signature Series 0W-30 Synthetic Motor Oil
Signature Series 0W-30 Synthetic Motor Oil
AMSOIL Signature Series 5W-30 Synthetic Motor Oil
Signature Series 5W-30 Synthetic Motor Oil
AMSOIL Signature Series 10W-30 Synthetic Motor Oil
Signature Series 10W-30 Synthetic Motor Oil
AMSOIL Signature Series 5W-50 Synthetic Motor Oil
Signature Series 5W-50 Synthetic Motor Oil
AMSOIL XL 0W-20 Synthetic Motor Oil
XL 0W-20 Synthetic Motor Oil
AMSOIL XL 5W-20 Synthetic Motor Oil
XL 5W-20 Synthetic Motor Oil
AMSOIL XL 5W-30 Synthetic Motor Oil
XL 5W-30 Synthetic Motor Oil
AMSOIL XL 10W-30 Synthetic Motor Oil
XL 10W-30 Synthetic Motor Oil
AMSOIL XL 10W-40 Synthetic Motor Oil
XL 10W-40 Synthetic Motor Oil
AMSOIL OE 0W-20 Synthetic Motor Oil
OE 0W-20 Synthetic Motor Oil
AMSOIL OE 0W-16 Synthetic Motor Oil
OE 0W-16 Synthetic Motor Oil
AMSOIL OE 5W-20 Synthetic Motor Oil
OE 5W-20 Synthetic Motor Oil
AMSOIL OE 5W-30 Synthetic Motor Oil
OE 5W-30 Synthetic Motor Oil
AMSOIL OE 10W-30 Synthetic Motor Oil
OE 10W-30 Synthetic Motor Oil
AMSOIL Z-ROD® 10W-30 Synthetic Motor Oil
Z-ROD® 10W-30 Synthetic Motor Oil
AMSOIL Z-ROD® 20W-50 Synthetic Motor Oil
Z-ROD® 20W-50 Synthetic Motor Oil
AMSOIL DOMINATOR® 5W-20 Racing Oil
DOMINATOR® 5W-20 Racing Oil
AMSOIL DOMINATOR® 10W-30 Racing Oil
DOMINATOR® 10W-30 Racing Oil
AMSOIL DOMINATOR® 15W-50 Racing Oil
DOMINATOR® 15W-50 Racing Oil
AMSOIL DOMINATOR® SAE 60 Racing Oil
DOMINATOR® SAE 60 Racing Oil
AMSOIL European Car Formula 5W-30 Improved ESP Synthetic Motor Oil
European Car Formula 5W-30 Improved ESP Synthetic Motor Oil
AMSOIL European Car Formula 5W-40 Improved ESP Synthetic Motor Oil
European Car Formula 5W-40 Improved ESP Synthetic Motor Oil
AMSOIL European Car Formula 5W-40 Classic ESP Synthetic Motor Oil
European Car Formula 5W-40 Classic ESP Synthetic Motor Oil
AMSOIL European Car Formula 0W-40 Classic ESP Synthetic Motor Oil
European Car Formula 0W-40 Classic ESP Synthetic Motor Oil
AMSOIL Synthetic Stationary Natural Gas Engine Oil
Synthetic Stationary Natural Gas Engine Oil
AMSOIL Synthetic Vehicular Natural Gas Engine Oil
Synthetic Vehicular Natural Gas Engine Oil
AMSOIL Premium Protection 10W-40 Synthetic Motor Oil
Premium Protection 10W-40 Synthetic Oil
AMSOIL Premium Protection 20W-50 Synthetic Motor Oil
Premium Protection 20W-50 Synthetic Oil
AMSOIL Break-In Oil (SAE 30)
Break-In Oil (SAE 30)
AMSOIL Engine Assembly Lube
Engine Assembly Lube
How do AMSOIL synthetic motor oils compare to other motor oils?
The importance of using good-quality oil in an engine cannot be overstated. AMSOIL synthetic motor oils consistently outperform conventional and other synthetic oils in virtually every category of performance, including wear protection, extreme high- and low-temperature performance, foam control, viscosity retention, rust and corrosion protection, volatility and fuel economy. While other brands may provide good performance in some of these areas, AMSOIL synthetic motor oils consistently perform at the top in every category. Drivers can have confidence knowing that AMSOIL synthetic motor oils provide maximum performance and protection.
What does the 'W' represent in 5W-30 motor oil?
The 'W' in 5W-30 motor oil stands for 'winter' and indicates the oil meets or exceeds certain criteria for good low-temperature performance. Motor oil with SAE viscosity grade 5W-30 behaves like an SAE 30 oil at high temperatures and SAE 5W oil at low temperatures, providing the necessary fluidity for rapid starts and efficient engine operation at low temperatures.
Is there a recommended procedure for changing to AMSOIL synthetic motor oil?
There are no special requirements for changing to AMSOIL synthetic motor oil. However, in older vehicles with high mileage, it may be advisable to use AMSOIL Engine and Transmission Flush first. This will ensure the engine is clean and free of accumulated contaminants that may affect the service life of AMSOIL synthetic motor oil. Installation of an AMSOIL Oil Filter at every oil change is also recommended.
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