FAQ

A Preferred Customer signs up for an annual AMSOIL membership for $20/year and gets 25% off every order for the life of their membership. No minimums, no quotas, no catch. You order directly from AMSOIL and it ships to your door.

You can sign up directly through Mill City Synthetics. It takes about five minutes and your discount is active immediately.

If you buy more than one oil change worth of product per year, yes, absolutely. Most customers save the membership fee back on their first order alone.

Yes. AMSOIL memberships renew annually and can be cancelled at any time.

A Preferred Customer buys AMSOIL at wholesale pricing for personal use. A Dealer does the same but also earns commissions by referring customers and building a team. If you’re just looking to save money on oil, PC is the right fit. If you want to build a business, dealership is worth exploring.

You get a real person — Josh or Becky — not a call center. We respond within the hour, we know our products because we run them ourselves, and we’ll tell you exactly what your vehicle needs without upselling. Text is the fastest way to reach us at (651) 300-2010.

The fastest way to find out is to text SPEC to (651) 300-2010 and we’ll look it up for you. You can also use the AMSOIL vehicle lookup tool. If you have an aftermarket build or modified engine, contact us directly — fitment for modified vehicles requires a conversation.

No. Under the Magnuson-Moss Warranty Act, a manufacturer cannot void your warranty simply because you use a different brand of oil, as long as the product meets the specifications listed in your owner’s manual. AMSOIL products meet or exceed OEM specifications and are Warranty Secure.

Signature Series is AMSOIL’s top-tier full synthetic motor oil, rated for up to 25,000 miles or one year between oil changes under normal service conditions. It provides 75% more engine wear protection than required by industry standards. It’s what we run in our own vehicles.

Signature Series is rated up to 25,000 miles or one year under normal service conditions. For severe service — towing, off-road, short trips, extreme temperatures — intervals are shorter. We always recommend following AMSOIL’s published drain intervals and using oil analysis to verify for your specific application.

Both are full synthetic oils, but AMSOIL is formulated to higher performance standards and longer drain intervals. AMSOIL is engineered to performance specifications, not down to a price point. Independent testing consistently shows AMSOIL outperforming Mobil 1 in wear protection, oxidation resistance, and cold temperature performance.

Yes — AMSOIL has a full line of diesel oils including Signature Series Max-Duty Synthetic Diesel Oil, rated up to 3x OEM drain intervals for heavy duty applications. Contact us for commercial diesel pricing and volume options.

For the engine we run AMSOIL Signature Series 0W-20 in our 2021 JL Rubicon with the 3.6L Pentastar. For the Dana 44 axles front and rear we recommend AMSOIL Severe Gear 75W-90. For the transfer case and transmission, use the AMSOIL vehicle lookup tool or text us your year and model for a full spec. If you’re lifted or running larger tires, we factor that in.

Yes — and this is where having a dealer who actually wheels makes a difference. If you’re running a lift, oversized tires, lockers, or aftermarket axles, the OEM spec may not be the only consideration. Text us your build and we’ll walk through the right products for your setup.

AMSOIL Severe Gear 75W-90 is our go-to for Dana 44 applications. It’s engineered for high-load, high-shock gear applications — exactly what a Jeep axle sees on the trail.

We run AMSOIL 10W-50 Synthetic Dirt Bike Oil in our KTM 450 EXC-F Six Days. It’s purpose-built for high-revving four-stroke dirt bike engines and handles the heat and mechanical shear these engines produce. Text us your specific model year for a confirmed spec.

The CFMoto Ibex 450 takes 10W-40. We run AMSOIL 10W-40 Synthetic Dirt Bike Oil in our 2026 Ibex. Text us for current pricing and availability.

Yes — AMSOIL has a full V-Twin line including engine oil, primary fluid, and transmission fluid specifically formulated for Harley-Davidson applications. These products meet or exceed Harley’s specifications and will not void your warranty.

AMSOIL has purpose-built products for both. For snowmobiles we recommend AMSOIL Interceptor 2-Stroke Oil or Formula 4-Stroke depending on your sled. For UTVs the AMSOIL ATV/UTV line is the go-to. Text us your make, model, and year for a specific recommendation.

The easiest way is to sign up as a Preferred Customer and order directly from AMSOIL at 25% off. Orders ship from one of 13 distribution centers across North America — most orders placed by 5PM Central Monday through Friday ship same day and arrive within 3-4 business days.

Yes — AMSOIL ships to Canada. Canadian customers can sign up as Preferred Customers through our referral link and order directly. Shipping times and costs vary by province.

We are a home-based dealership in Woodbury, MN and do not operate a retail storefront. We do carry select products for sale at our event booth appearances throughout the year. Check our events page to find us near you.

We aim to respond within the hour during normal business hours. Text is the fastest way to reach us — (651) 300-2010.

Mill City Synthetics is an authorized AMSOIL independent dealership owned and operated by Josh and Becky Friesen, based in Woodbury, MN. We’re Jeep and powersports enthusiasts who use AMSOIL in everything we own. We became AMSOIL dealers because we already believed in the product.

Yes — we provide free consultations for retail customers, Preferred Customers, and commercial accounts. Whether you need help finding the right oil or want to explore commercial pricing for your fleet, reach out. Text (651) 300-2010 or use the contact form on our website.

We attend 28+ events per year across Minnesota and the region including Jeep Jamboree, car shows, powersports events, and more. Check our events page for upcoming appearances.

Yes. Josh served in the U.S. Army and Mill City Synthetics is a proud veteran-owned business.

AMSOIL dealerships start at $100 with no inventory requirements, no sales quotas, and no monthly fees. You earn commissions on your personal sales and on the sales of customers and dealers you refer. If you’re interested in learning more, visit our Join Our Team page or contact us directly.

As your sponsoring dealer we provide onboarding guidance, access to our systems and playbooks, and ongoing support as you build your business. We’re building Mill City Synthetics as a proof of concept for a franchise-style AMSOIL dealership model — new dealers in our network benefit from that work.