AMSOIL Oil: The Best Oil for Your Engine
AMSOIL just reformulated its entire motorcycle oil lineup, here’s what changed and exactly which product fits your specific machine. US & Canada, 2026.
$20/year, up to 25% off every order, no quotas or minimums. See how the membership works →
By Alan Williams, AMSOIL Direct Jobber #1243776 · Tomball, TX · 225-441-6397
20+ years matching riders to the right AMSOIL product, and the lineup just changed this summer, so even longtime AMSOIL customers should double check they’re still asking for the right bottle.
Last updated 2026. Reviewed against AMSOIL’s June 2026 motorcycle oil line reformulation announcement.
On This Page
Quick Answer
AMSOIL builds distinct motorcycle oil lines for distinct engine types, not one universal formula: 20W-50 Synthetic V-Twin for Harley-Davidson and American cruisers, the new 100% Synthetic Motorcycle Oil line (available in 5W-40, 10W-30, 10W-40, 10W-50, and 15W-50) for metric street, sport, adventure, and touring bikes, plus dedicated dirt bike and scooter formulations. All of the four-stroke street lines meet API SP and JASO MA2, and are WARRANTY SECURE, meaning using them won’t void your factory motorcycle warranty.
“Best oil for your engine” isn’t one product, it’s whichever one matches your specific bike’s viscosity requirement and clutch type. Picking by brand alone without checking viscosity is the most common mistake riders make.
Recent News
What Changed in the June 2026 Refresh
AMSOIL replaced its previous Synthetic Metric Motorcycle Oil with a new 100% Synthetic Motorcycle Oil line, formulated for four-stroke street, adventure, touring, and racing motorcycles. According to AMSOIL’s director of product marketing and powersports, the reformulation was built specifically to improve gear protection in wet-clutch bikes, maintain film thickness in high heat, and resist shearing and foaming, with reliable protection intended to hold up under sustained load, heat, and aggressive riding.
The new line meets or exceeds API SP and JASO MA2, backward compatible with older motorcycle models despite being built around the newest specifications. It’s manufactured, blended, and packaged in the United States and sold in 5W-40, 10W-30, 10W-40, 10W-50, and 15W-50 grades, covering most metric sport, cruiser, adventure, and touring applications.
The Lineup, Explained
Which AMSOIL Product Actually Fits Your Machine
| Your machine | AMSOIL product |
|---|---|
| Harley-Davidson / American V-Twin cruisers | 20W-50 Synthetic V-Twin Motorcycle Oil |
| Vintage Knucklehead, Panhead, or Shovelhead engines | SAE 60 Synthetic V-Twin Motorcycle Oil |
| Honda, Yamaha, Kawasaki, Suzuki, BMW, KTM, Ducati, Triumph | 100% Synthetic Motorcycle Oil (match viscosity: 5W-40, 10W-30, 10W-40, 10W-50, or 15W-50 to your manual) |
| Off-road / dirt bikes | Dedicated dirt bike oil formulation, separate from the street lineup |
| Scooters and CVT/dry-clutch applications | JASO MB-rated scooter oil, not wet-clutch compatible, don’t cross-use with wet-clutch bikes |
Always confirm your exact model’s viscosity requirement against your owner’s manual or AMSOIL’s product lookup guide before ordering.
Get the newly reformulated AMSOIL motorcycle oil matched to your exact machine, at wholesale pricing.
A Mistake Even Brand-Loyal Riders Make
The Primary Fluid Mistake AMSOIL Itself Warns Against
Here’s a detail AMSOIL’s own technical FAQ addresses directly, and one riders shopping within the AMSOIL lineup still get wrong: AMSOIL Series 2000 Synthetic Chaincase Lubricant is not the correct viscosity for a Harley-Davidson Big Twin primary, despite “chaincase” sounding like exactly the right product for that job. AMSOIL’s own guidance recommends its 20W-50 Synthetic Motorcycle Oil for Harley primaries instead.
This is worth flagging precisely because it’s an easy mistake to make even while shopping entirely within one trusted brand’s lineup, product names don’t always map intuitively to the compartment they’re meant for. When in doubt, check the specific application list on the product page rather than assuming the name alone tells you enough.
Alan’s Take
“Even I double-checked the spec sheet when this year’s refresh dropped, because a name change plus a viscosity lineup shuffle is exactly the kind of thing that trips up someone reordering out of habit. If you’ve been buying the same bottle for years, take two minutes to confirm it’s still the current product before your next order.”
Frequently Asked Questions
What replaced AMSOIL’s Synthetic Metric Motorcycle Oil?
AMSOIL’s new 100% Synthetic Motorcycle Oil line, introduced in mid-2026, formulated for four-stroke street, adventure, touring, and racing motorcycles, meeting API SP and JASO MA2.
Can I use AMSOIL Series 2000 Chaincase Lubricant in my Harley primary?
No. AMSOIL’s own guidance states this product does not have the correct viscosity for a Harley-Davidson primary and instead recommends AMSOIL’s 20W-50 Synthetic Motorcycle Oil for that application.
Is AMSOIL motorcycle oil safe for scooters?
AMSOIL’s dedicated scooter oil is JASO MB rated, suited for dry-clutch or CVT scooters, and should not be cross-used with wet-clutch motorcycle oil applications or vice versa.
Will using AMSOIL void my motorcycle’s factory warranty?
No. AMSOIL’s four-stroke street motorcycle oils are described as WARRANTY SECURE, meeting the required API and JASO specifications, so using them does not void a factory warranty.
Get the Newest Formula, Matched to Your Bike
Join as an AMSOIL Preferred Customer and get the current motorcycle oil lineup at wholesale pricing.
- 25% off every AMSOIL product, permanently
- Ships to the US and Canada
- No minimum orders, no obligation to sell
- $5 birthday coupon plus ongoing rewards
$20/yr, Dealer #1243776, ships US & Canada
Interested in Selling AMSOIL Instead of Just Buying It?
AMSOIL Dealers earn commission on every sale, set their own hours, and build a business around a product line people already need. No quotas, no inventory requirements to start.
Continue the Motorcycle & Powersports Oil Guide
Disclaimer & affiliate disclosure: Product line information reflects AMSOIL’s published announcements and product data as of mid-2026 and is subject to change; always confirm current specifications and application fitment on AMSOIL’s own product pages or lookup guide before ordering. AMSOIL and all brand names referenced are registered trademarks of their respective owners. Lube Oil Sales is an Authorized AMSOIL Independent Dealer (Dealer #1243776). This page contains affiliate links. Last updated: 2026.