AMSOIL guide
AMSOIL vs Mobil 1
AMSOIL Signature Series is the longest-drain option in the AMSOIL gasoline lineup, supporting drain intervals up to 25,000 miles in normal service. Mobil 1 Extended Performance is a widely available extended-drain retail oil. Both brands offer full synthetic formulas for modern passenger cars. The practical differences live in current product-page guidance, owner-manual requirements, application coverage, and how you prefer to buy.
AMSOIL vs Mobil 1 at a glance
| Spec | AMSOIL Signature Series | Mobil 1 Extended Performance |
|---|---|---|
| Drain-interval positioning | Longest-drain AMSOIL gasoline option, up to 25,000 miles in normal service | Extended-drain retail option, up to 20,000 miles per Mobil 1 marketing |
| Specification check | Confirm on the AMSOIL Lookup Guide and in your owner's manual | Confirm on the current Mobil 1 product page and in your owner's manual |
| European coverage | European Car Formula (Low-SAPS and full-SAPS lines) | Mobil 1 ESP (full European OEM approval list on the product page) |
| Where to buy | Buy online | Product details | Big-box retail, parts store |
How AMSOIL organizes its motor oil lineup
AMSOIL splits passenger-car motor oils into three service tiers. Signature Series is the longest-drain option in the lineup. Extended-Life (XL) is the extended-drain option that matches OEM specifications where the formula qualifies. OE is built for factory-interval service.
Beyond the gasoline lineup, AMSOIL builds European Car Formula oils for vehicles that require a European owner-manual specification, plus hybrid-specific viscosities, racing oils, and a full diesel lineup. The full picture lives in the AMSOIL car oil guide.
How Mobil 1 organizes its motor oil lineup
Mobil 1's gasoline lineup includes Advanced Full Synthetic, Extended Performance, Annual Protection, Truck and SUV, High Mileage, and ESP for European applications. Most grades are sold through big-box retailers and parts stores. Confirm the current SAE viscosity and service category on the product page before ordering.
AMSOIL Signature Series vs Mobil 1 Extended Performance and Annual Protection
AMSOIL Signature Series is the longest-drain option in the AMSOIL lineup, supporting drain intervals up to 25,000 miles in normal service when paired with a qualifying AMSOIL Ea-O oil filter. Mobil 1 Extended Performance and Annual Protection are extended-drain retail oils, but the right interval still depends on the product page, the vehicle, and the owner's manual.
For owners targeting longer service, confirm the current AMSOIL product-page guidance and choose the matching oil filter for the same service plan.
European OEM coverage: AMSOIL European Car Formula vs Mobil 1 ESP
AMSOIL European Car Formula is organized around current European owner-manual requirements and aftertreatment needs. The line is split by application, including Low-SAPS choices for newer particulate-filter-equipped engines and full-SAPS choices for engines without a gasoline or diesel particulate filter.
Mobil 1 ESP covers European applications. Confirm the current OEM approval list on the Mobil 1 ESP product page. For a European car owner, browse AMSOIL's European motor oil page first and confirm the required approval against your owner's manual.
Independent test data: cold-cranking, TBN, and high-temp viscosity
Three industry-standard test panels are commonly used to compare protection between premium synthetic oils: cold-cranking viscosity (CCS), Total Base Number retention (TBN), and high-temperature viscosity control (HTHS). Compare the AMSOIL Signature Series published numbers against the matching values on the current Mobil 1 product page for the same SAE grade.
AMSOIL publishes Signature Series test data showing strong wear, cleaning, and turbocharger protection. The full Signature Series summary lives on the Signature Series 5W-30 spec page, with the matching product on the AMSOIL Signature Series page.
Bottom line: which synthetic motor oil should you pick?
- Longest drain interval, towing, or severe service. Pick AMSOIL Signature Series in your owner-spec viscosity (also online from AMSOIL).
- OEM oil-life monitor target, on a budget. Pick AMSOIL OE over Mobil 1 Advanced Full Synthetic to match the factory-interval target at a comparable per-quart cost once Preferred Customer pricing applies.
- European car with a Longlife requirement. Pick AMSOIL European Car Formula that matches your owner-manual requirement.
- You shop at the parts store. Mobil 1 Extended Performance is the common shelf pick. If you want the AMSOIL longest-drain option at a comparable per-quart cost, add an AMSOIL Preferred Customer membership and order Signature Series online from AMSOIL.
Save on AMSOIL with Preferred Customer pricing
AMSOIL Preferred Customer membership is $20 USD per year ($10 USD for a six-month trial) and unlocks up to 25% off on every product, with free shipping on qualifying orders. Add the membership to the same cart as your order and qualifying products switch to member pricing on that checkout, with no separate sign-up step. See the breakdown on the AMSOIL Preferred Customer page, or sign up directly through the AMSOIL Preferred Customer enrollment page.
AMSOIL vs Mobil 1 FAQ
Are AMSOIL and Mobil 1 both full synthetic?
Yes. AMSOIL Signature Series, Extended-Life, and OE motor oils, and Mobil 1 Advanced Full Synthetic, Extended Performance, Annual Protection, Truck and SUV, High Mileage, and ESP are all full synthetic gasoline motor oils. Always confirm the specific grade and approvals on the product page for your application.
Can I switch from Mobil 1 to AMSOIL?
Yes. Both are full synthetic passenger-car oils in the relevant grades, so you can switch on your next oil change with no flush required as long as the new oil matches the viscosity and current approvals your owner's manual specifies.
Which lasts longer, AMSOIL Signature Series or Mobil 1 EP?
AMSOIL Signature Series is the longest-drain option in the AMSOIL gasoline lineup, supporting drain intervals up to 25,000 miles in normal service. Mobil 1 Extended Performance and Annual Protection are positioned as extended-drain retail oils. Check the current product pages and your owner's manual before choosing an interval.
Does AMSOIL meet current OEM and industry specifications like Mobil 1?
AMSOIL maintains current API, ILSAC, and OEM-licensed approvals where the formula qualifies. Check the live AMSOIL product page and your owner's manual for the current approval match before ordering.
Is AMSOIL more expensive than Mobil 1?
At retail, yes. AMSOIL Signature Series typically lists above shelf-price Mobil 1 Extended Performance. Add an AMSOIL Preferred Customer membership to the same cart and qualifying products switch to member pricing on that checkout, with up to 25% off retail. The math typically lands AMSOIL Signature Series at or below Mobil 1 Extended Performance per quart once membership pricing applies.
Where can I buy AMSOIL motor oil?
Order online from AMSOIL on the gasoline motor oil page, or pick a specific viscosity first on the gasoline motor oil overview with side-by-side spec comparisons.
Order AMSOIL Signature Series
Order online from AMSOIL's Signature Series motor oil page. To unlock up to 25% off, add an AMSOIL Preferred Customer membership to the same cart and qualifying products switch to member pricing immediately, with no separate sign-up step.