Your Factory Warranty Is Protected When You Run AMSOIL
Federal law prohibits dealers from voiding your warranty over oil brand — and they must prove causation before denying any claim. AMSOIL backs that with its own written performance guarantee. Here's exactly what covers you, in plain language.
"In nearly three decades of commercial truck and coach work, I've seen dealers threaten to void warranties over oil brand choice more times than I can count. They can't do it — and haven't been able to since 1975. The law is explicit. The burden of proof sits with the manufacturer, not the customer."
Magnuson-Moss Act
US federal law since 1975. Prohibits manufacturers and dealers from tying warranty coverage to any specific brand of parts or lubricants. Burden of proof is on them — not you.
AMSOIL Limited Warranty
If an AMSOIL lubricant fails to perform as specified on its label and causes mechanical damage, AMSOIL covers repair or replacement. No odometer mileage cap.
Warranty Secure
All AMSOIL lubricants meet or exceed OEM specifications — API, ILSAC, ACEA, and manufacturer-specific approvals. The Warranty Secure designation confirms compliance across the product line.
The Magnuson-Moss Warranty Act has been federal law since 1975. It prohibits vehicle manufacturers and their dealers from tying factory warranty coverage to the use of any specific brand of parts, fluids, or lubricants — unless those products are provided free of charge as part of the warranty service itself.
In plain terms: a dealer cannot legally void your engine warranty because you chose AMSOIL synthetic instead of their house brand. They can't make this claim verbally. They can't make it in writing. The Federal Trade Commission enforces this law and takes violations seriously.
If a manufacturer or dealer wants to deny a warranty claim based on your lubricant choice, they must prove that the specific product caused the failure. The burden of proof sits with them — not you. A dealer who says "that oil voided your warranty" without demonstrating causation is making a claim they cannot legally sustain.
Your strongest protection is documentation. Keep receipts for every oil change, filter replacement, and fluid service — including services you perform yourself. Record the product name, viscosity grade, part number, and date. If a warranty dispute arises, your records demonstrate proper maintenance.
A dealer cannot deny a claim simply because you used AMSOIL. They must produce evidence that AMSOIL caused a specific failure — and "we recommend our brand" is not evidence.
If you believe a manufacturer or dealer has unlawfully denied a warranty claim, file a complaint with the Federal Trade Commission: ReportFraud.ftc.gov. You can also contact your state attorney general's office for additional recourse.
Beyond the legal framework, AMSOIL offers its own written limited warranty on lubricants, filters, and bypass filter systems. If an AMSOIL product fails to perform as described on its label and that failure results in covered mechanical damage, AMSOIL will pay for the cost of repair or replacement of the affected components.
- No odometer cap. Coverage isn't cut off at 100,000 or 150,000 miles. If an AMSOIL product fails to perform as specified — at any mileage — and causes damage, the warranty applies. Use AMSOIL throughout a vehicle's life and the warranty stays with it.
- Extended drain intervals included. Using AMSOIL's rated drain intervals (such as Signature Series up to 25,000 miles or 1 year in normal service) is consistent with warranty coverage, provided you follow AMSOIL's guidelines and maintain service records. You don't have to change oil every 5,000 miles to stay protected.
- OEM specifications met or exceeded. Every AMSOIL lubricant is formulated to meet API, ILSAC, ACEA, and manufacturer-specific approval requirements — the same standards your OEM warranty references. Your factory warranty doesn't specify a brand; it specifies a specification. AMSOIL meets them.
Separate warranty documents govern lubricants, filters, and bypass filter systems. Review the full terms for the specific product before making any warranty-related decisions.
Running AMSOIL INTERCEPTOR® in a snowmobile? AMSOIL offers an additional Runs on Freedom® Snowmobile Warranty covering engine repairs up to 24 months or 5,000 miles. View the snowmobile warranty details →
Canadian consumers are protected by the Competition Act, administered by the Competition Bureau of Canada. Under paragraph 74.01(1)(c) of the Act, making false or misleading representations about the warranty or guarantee of a product is a prohibited deceptive marketing practice.
A dealer or manufacturer who tells a Canadian customer their factory warranty is void because they used AMSOIL — without being able to demonstrate that the product caused the failure — may be making a misleading representation prohibited under Canadian federal law.
The Competition Bureau treats these violations seriously. First-time corporate violations can result in administrative monetary penalties of up to $10 million, or three times the value of the benefit derived from the conduct — whichever is greater.
If you believe a warranty claim has been improperly denied, contact the Competition Bureau toll-free at 1-800-348-5358 or online at competition-bureau.canada.ca.
All AMSOIL products sold into Canada carry the Warranty Secure designation and are formulated to meet OEM specifications for Canadian-market vehicles. Your protection is the same whether you're buying in Minnesota or Manitoba.
No. The Magnuson-Moss Warranty Act prohibits US manufacturers and dealers from denying warranty coverage because you chose an aftermarket lubricant — unless the dealer can prove that specific product caused the failure. The burden of proof is on the dealer, not you. Verbal threats to void a warranty over oil brand choice have no legal standing.
You are not legally required to disclose your oil brand choice. That said, using a product that meets or exceeds OEM specifications — which every AMSOIL product does — gives you strong ground to stand on. What matters most is keeping your own documentation: product used, viscosity, date, and mileage at each service, whether you do the work yourself or have a shop do it.
AMSOIL's Limited Warranty covers mechanical damage that results directly from an AMSOIL lubricant failing to perform as described on its label — when used in the correct application and within rated drain intervals. It does not cover normal wear and tear, pre-existing mechanical conditions, or damage from improper product selection or installation. Separate warranty documents apply to lubricants, filters, and bypass filter systems. Download the relevant PDF above and review the full terms.
No — provided you follow AMSOIL's drain interval guidelines and keep documentation. The Magnuson-Moss Act requires that you properly maintain your vehicle; it does not require you to follow the OEM's exact oil change schedule. If a dealer claims an extended drain interval voided your warranty, they must produce evidence that the interval caused the specific failure — not simply that you went longer between changes. Document every service interval and you're protected.
Yes. AMSOIL lubricants are formulated to meet or exceed API, ILSAC, ACEA, and manufacturer-specific specifications — including GM dexos, Chrysler MS-6395, Ford WSS-M2C series, and equivalent European OEM approvals. Factory warranties reference these specifications, not brand names. AMSOIL's Warranty Secure designation confirms that its products satisfy those requirements. Use the vehicle lookup to confirm the correct product and specification for your application.
Request the denial in writing. Ask the dealer to specify — in writing — exactly which product they believe caused the failure and how they determined causation. If they can't produce evidence of causation, the denial may not hold. US customers can file a complaint with the FTC at ReportFraud.ftc.gov or contact their state attorney general. Canadian customers can contact the Competition Bureau at 1-800-348-5358. Your maintenance records are your strongest asset in any dispute.
Run AMSOIL with Full Confidence
Every AMSOIL product is Warranty Secure — formulated to OEM specs, backed by a written performance guarantee, and protected by federal law on both sides of the border.
Shop AMSOIL Products Not sure which oil? Use the Vehicle Lookup →