AMSOIL Test Results & Resources
Real lab data and cross-reference charts, not marketing copy: how AMSOIL compares to Mobil 1, what synthetic diesel oil actually delivers, and the exact Harley filter that fits your bike. US & Canada, 2026.
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By Alan Williams, AMSOIL Direct Jobber #1243776 · Tomball, TX · 225-441-6397
Anyone can claim their oil is “the best.” This page exists to point you at the actual evidence instead, independent lab test results, real cross-reference charts, and specification data with the source cited, so you can verify it yourself rather than take a dealer’s word for it. Three resources live here, each covering a different question.
AMSOIL vs Mobil 1: Lab Test Results & Cost Compared
Real wear-scar, TBN, and cost-per-mile comparisons between AMSOIL Signature Series and Mobil 1, sourced from independent lab data rather than either brand’s own marketing claims.
Diesel Fuel Savings with AMSOIL Synthetic Heavy-Duty Diesel Oil
What AMSOIL Signature Series Max-Duty Synthetic Diesel Oil actually delivers in independent third-party testing: wear protection, oil consumption, and turbo cleanliness, with real numbers and real cost math for today’s fuel prices.
Harley-Davidson Oil Filter Chart
Real AMSOIL, OEM, Fram, WIX, and K&N part numbers by engine, plus why a “5-micron” claim and a “98.7% efficient” claim aren’t actually measured on the same scale.
The Preferred Customer Program
Wholesale Pricing on Everything Tested Here
- 25% off retail pricing on every AMSOIL product, every order, all year
- $20 a year (charged in local currency at checkout for Canadian members), no minimum purchases
- Ships to both the US and Canada
Sign up once, save 25% on every order after.
$20/year, no minimums, ships to the US & Canada.
Alan’s Take
“I’ve been selling AMSOIL for over 20 years, and the reason I still believe in it isn’t loyalty, it’s that the test data holds up every time someone checks it against a competitor. Pick any of the three resources above and look at the source, not just the headline number. That’s the whole point of this page.”
Disclaimer: Test data referenced on this page and its linked resources is sourced from AMSOIL’s own published testing disclosures and independent third-party test methodologies where cited; always confirm current figures against AMSOIL’s official product data sheets. AMSOIL and Mobil 1 are registered trademarks of their respective owners. Lube Oil Sales is an Authorized AMSOIL Independent Dealer (Dealer #1243776). This page contains affiliate links to AMSOIL’s Preferred Customer program. Last updated: July 2026.