Frequently Asked Questions

General Questions

What is AMSOIL?

AMSOIL INC. pioneered synthetic lubricants for automotive use and remains a leader in synthetic lubrication technology. Learn more: AMSOIL Company Overview.

Why choose synthetic lubricants instead of conventional oil?

Synthetic lubricants are engineered for cleaner operation, strong wear protection and improved efficiency. See the overview: Why Synthetic Oil?

What does "100% synthetic" really mean?

Get a clear, plain-English breakdown of industry terms here: 100% Synthetic vs. Full Synthetic.

Product Questions

How do Signature Series, Extended-Life (XL) and OE motor oils differ?

• Signature Series – premium protection with extended-drain capability up to 25,000 miles or 1 year in normal service. Browse: Gasoline Motor Oil.
• Extended-Life (XL) – designed for up to 20,000 miles or 1 year. See example: Extended-Life 5W-30.
• OE Series – formulated for original-equipment recommended drain intervals. See: OE 5W-30.

How often should I change AMSOIL motor oil?

For passenger vehicles using Signature Series, change oil up to 25,000 miles or 1 year in normal service, or up to 15,000 miles or 1 year in severe service. Read the guidance: AMSOIL Oil Change Interval. Always verify with the Product Guides and your owner's manual.

Does AMSOIL make lubricants for diesel, powersports and industrial equipment?

Yes. AMSOIL offers dedicated oils, fluids and greases for cars and trucks, diesel, motorcycles, ATVs/UTVs, marine, small engines and more. Start here: Shop by Product Type.

What gear and transmission lubricants are available?

Explore SEVERE GEAR and the full transmission-fluid lineup:

• Gear Oil
• Transmission Fluid

Do you offer high-efficiency oil filters?

Yes. AMSOIL Ea Oil Filters provide 99% efficiency at 20 microns (ISO 4548-12). See the filter family: AMSOIL Oil Filters.

Warranty & Compatibility

Will using AMSOIL void my factory warranty?

No. AMSOIL products are Warranty Secure, and the Magnuson-Moss Warranty Act protects your right to choose lubricants. Read the policy: AMSOIL Guarantee.

Can I mix AMSOIL with another brand of oil?

AMSOIL motor oils are compatible with other synthetic or conventional oils. However, mixing reduces performance and life, and AMSOIL does not support extended drain intervals on mixed fills. Details: AMSOIL FAQ.

Product Selection & Technical Help

How do I pick the right viscosity for my engine?

Use the viscosity your owner's manual specifies. For background, see: Understanding Oil Viscosity.

Is there a quick way to see everything my vehicle needs?

Yes. Use the Product Guides to view recommended engine oil, transmission fluid, gear lube, coolant, capacities and more: Auto & Light Truck Lookup or All Product Guides.

Do AMSOIL lubricants meet OEM specifications?

AMSOIL designs formulations to meet or exceed applicable industry standards (API, ILSAC, ACEA, JASO, etc.). Check each product page or data sheet via Product Support.

Purchasing & Programs

Where can I buy AMSOIL products?

Order online through AMSOIL using the links on this page so your purchase routes through Pro Edge Lubricants: Shop AMSOIL Online.

What is the Preferred Customer Program?

Preferred Customers save up to 25% on every order and receive exclusive offers. Enroll here: Become a Preferred Customer.

Maintenance & Service

Do I need to change the filter every time I change motor oil?

Yes. Install a fresh, high-capacity filter with every oil change. Learn why: Oil Filtration Basics.

Can I extend drain intervals in severe operating conditions?

Yes, but follow the reduced severe-service interval. For Signature Series, that is up to 15,000 miles or 1 year. See details: AMSOIL Oil Change Interval.

Support

How do I contact AMSOIL for technical questions?

Use AMSOIL's contact page for Technical Services or customer support: Contact AMSOIL. For purchases, please use the online shopping links above.

Disclaimers

• Always verify recommendations with the AMSOIL Product Guides and your owner's manual.
• Performance claims are based on AMSOIL testing and industry standards. Results may vary.
• Warranty Secure applies when products are used as directed by AMSOIL.

Need personalized advice? Pro Edge Lubricants is your Authorized AMSOIL Dealer and we are happy to help you select the right products for every vehicle and piece of equipment.