High-Performance Synthetic Motor Oils and Lubricants

Why Synthetic Oil?

Learn about the differences between conventional and synthetic lubricants and review performance test results.

Learn More

Find Products For Your

All-Terrain Vehicle

Auto/Light Truck

Heavy Duty



Personal Watercraft

Small Engine


Utility Terrain Vehicle

Three Tiers of Premium Performance

  • Outstanding wear protection
  • Maximum cleanliness
  • Exceptional extreme-temperature protection
Learn More

  • Boosted cleaning power
  • Protects against wear
Learn More

  • Outperforms conventional motor oil
  • Protection to cover longer oil life monitor drain intervals
Learn More

Request A Free Catalog

Browse the full line of premium products in the latest factory direct catalog.


Flatwater Synthetics is a Full Service Independent Dealer

Flatwater Synthetics 1126 North Briggs Avenue
Hastings, Nebraska 68901
Phone: 402-519-4677 | Email: info@flatwatersynthetics.com

Save Approximately 25% On Every Order

Register as an AMSOIL Preferred Customer and save approximately 25% on all AMSOIL products.
* FREE subscription to AMSOIL Magazine
* Premium protection and performance for all of your vehicles and equipment
* Access to the entire AMSOIL product line at wholesale prices

Learn More

Product Categories

Motor Oils

Transmission Fluids

Filtration Products

Fuel Additives

Gear Lubes


Hydraulic Oils

Compressor Oils

Recent Articles and Information

Privacy Settings
We use cookies to enhance your experience while using our website. If you are using our Services via a browser you can restrict, block or remove cookies through your web browser settings. We also use content and scripts from third parties that may use tracking technologies. You can selectively provide your consent below to allow such third party embeds. For complete information about the cookies we use, data we collect and how we process them, please check our Privacy Policy
Consent to display content from Youtube
Consent to display content from Vimeo
Google Maps
Consent to display content from Google