Diesel Fuel Additives

Free Shipping with $49 Order

• Exclusive offer for AMSOIL Preferred Customers and online/catalog customers.
• Valid through 11:59 p.m. Central Aug. 11, 2026.
• To redeem, use code FREESHIP at checkout.
• Code will automatically apply free shipping, if eligible, at checkout.
• Valid with orders of $49 or more based on subtotal with savings.
• Limited to free standard ground shipping.
• Offer not valid in Alaska or Hawaii.

Free Padlock with $100 Order

• Exclusive offer for AMSOIL Preferred Customers and online/catalog customers.
• Valid through 11:59 p.m. Central Aug. 11, 2026.
• Offer applies only to current orders of $100 or more based on subtotal with savings.
• Limited to one free AMSOIL padlock (G3934).
• To redeem, use code LOCK826 at checkout.
• Code will automatically apply product, if eligible, in cart at checkout.
• Offer may be modified or terminated at any time except as prohibited by law.
• Available while supplies last.

Free Shipping with $49 Order

• Exclusive offer for AMSOIL Preferred Customers and online/catalog customers.
• Valid through 11:59 p.m. Central Aug. 11, 2026.
• To redeem, use code FREESHIP at checkout.
• Code will automatically apply free shipping, if eligible, at checkout.
• Valid with orders of $49 or more based on subtotal with savings.
• Limited to free standard ground shipping.
• Offer not valid in Alaska or Hawaii.

Free Padlock with $100 Order

• Exclusive offer for AMSOIL Preferred Customers and online/catalog customers.
• Valid through 11:59 p.m. Central Aug. 11, 2026.
• Offer applies only to current orders of $100 or more based on subtotal with savings.
• Limited to one free AMSOIL padlock (G3934).
• To redeem, use code LOCK826 at checkout.
• Code will automatically apply product, if eligible, in cart at checkout.
• Offer may be modified or terminated at any time except as prohibited by law.
• Available while supplies last.