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Prices may varyThis product ranks #6 of 24 in Motor Oil.Three above it ↓
Last reviewed June 9, 2026
TL;DR API SP + ILSAC GF-6A with GM dexos1 Gen 3, Ford WSS-M2C946-B1, Stellantis MS-6395, and Honda HTO-06 OEM approvals · among the broadest coverage in a consumer full synthetic. The 25,000-mile label claim is aspirational: BITOG UOA data supports healthy oil at 12,000·15,000 miles on typical daily-driver use.
Full synthetic on a PAO Group IV plus Group III hydrogenated base stack, certified to API SP + ILSAC GF-6A. The product page lists dexos1 Gen 3, WSS-M2C946-B1, MS-6395, and HTO-06 · broader OEM coverage than most consumer synthetics. The 25k label is for normal (non-severe) service; community UOA threads cluster around 12k·15k with healthy TBN.
Best for 2020·2026 GM, Ford, Stellantis, and Honda/Acura owners whose engines specify 5W-30 and require one of those named approvals · Signature covers all four in one bottle. Skip if cost-per-quart matters most; conventional API SP at OEM intervals costs a fraction. Skip for pre-2010 flat-tappet engines where ZDDP loading outweighs GF-6A fuel-economy credits.
SDS §2 classifies this as not hazardous · no signal word, no mixture-level H-codes. H304 is waived via the CLP viscosity exemption (KV40 = 61.7 cSt). No Prop 65 warning on the product listing or in SDS §15. The SDS on file was last revised in 2019 · seven years old; H-codes here reflect that revision and may not capture additive changes since, and the API SP / GF-6A certification (launched May 2020) postdates the SDS. IARC classifies mineral oil mist from used-oil combustion byproducts as a Group 1 carcinogen based on occupational studies; minimize skin contact during oil changes. Used oil goes to collection · not down the drain. AutoZone, O'Reilly, and municipal hazardous-waste facilities accept it.
The 25,000-mile interval is AMSOIL's label claim for normal (non-severe) service. Community UOA data from BITOG (Bob Is The Oil Guy) forum threads consistently shows healthy TBN and low oxidation markers at 12,000·15,000 miles on typical daily-driver use, with several documented runs past 20,000 miles on highway-dominant driving. The oil is genuinely capable past 10,000 miles; the full 25,000 figure is achievable under favorable conditions but is not the median real-world result. AMSOIL recommends following the OEM drain interval for severe service.
Yes · AMSOIL lists GM dexos1 Gen 3 among the OEM approvals on the Signature Series product page. dexos1 Gen 3 is the current approval required for 2020+ GM gasoline vehicles. The product also lists Ford WSS-M2C946-B1, Stellantis MS-6395, and Honda HTO-06 approvals. Confirm the current OEM approval list on AMSOIL's product page before relying on this oil for warranty documentation.
API SP is the current top-tier gasoline engine oil specification through 2026, succeeding API SN Plus. ILSAC GF-6A adds fuel economy and chain-wear protection on top of API SP · required for most 2020+ gasoline passenger vehicles from Toyota, Honda, Ford, and GM. Using API SP + ILSAC GF-6A oil provides the deposit control, oxidation stability, and LSPI (low-speed pre-ignition) protection that older specs (API SN, SM) may not fully deliver for turbocharged or GDI engines.
Yes. SDS §3 confirms a base stock of Dec-1-ene homopolymer (PAO Group IV, 10·30%) and hydrogenated base oil (Group III, 10·30%) · a Group III + Group IV synthetic blend within the formulation, both classified as full synthetic under API base stock definitions. There is no Group I or Group II conventional content disclosed.
AMSOIL lists Honda/Acura HTO-06 among the approvals for Signature Series 5W-30. Honda Genuine Motor Oil is Honda's private-label product; any oil meeting the HTO-06 spec is functionally equivalent for warranty purposes in engines specifying a 5W-30 viscosity grade. HTO-06 on the 5W-30 grade does not substitute for applications requiring 0W-20 · viscosity-grade match is still required.
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