Polyalphaolefin (PAO)

base_oil
CAS 68037-01-4
IUPAC: poly(1-decene), hydrogenated

Generally low hazard. Not classified as hazardous under GHS/CLP at standard viscosity grades. No significant inhalation, skin, or ingestion risks under normal handling conditions.

Polyalphaolefin (PAO) is the primary synthetic base oil in full-synthetic motor oils. Made from polymerization of alpha-olefin monomers (typically 1-decene), PAO offers excellent low-temperature fluidity, high viscosity index, and oxidation stability vs mineral oils. Group IV base oil designation under API classification. Fully formulated motor oils blend PAO with additive packages including ZDDP, detergents, dispersants, and viscosity modifiers. ## Regulatory status - Not listed under CA Prop 65 - Not classified as hazardous under GHS/CLP - API Group IV classification

Health & environment profile

VOC: no
Prop 65 listed: no
Asthmagen: no
EPA Safer Choice: no
Aquatic toxicity: no
Biodegradable: no
Bioaccumulative: no
Persistent: no
Ozone depleting: no
Microplastic: no
PFAS: no
Env. score: 4/5

Purpose: Primary synthetic base oil in full-synthetic motor oils; Group IV base oil under API classification

No products on file contain this (yet)

Health summaries are editorial — we synthesize from SDSs, peer-reviewed sources, and regulatory listings. Not medical advice.