Engine Oil SDS CAS Numbers Reference Table: Base Oils and Additives
When choosing engine oil, many car enthusiasts often wonder whether the “Full Synthetic” label on the bottle actually uses true PAO (Group IV), Esters (Group V), or highly hydrocracked VHVI (Group III) base oils. The most objective and direct way to uncover the mystery of an engine oil’s formulation is to check its Safety Data Sheet (SDS / MSDS).
In an SDS document, each chemical component is labeled with a unique CAS Number (Chemical Abstracts Service Registry Number), which acts as the “ID card” for chemical substances. To help you quickly decode these cryptic codes, this article compiles a reference table of CAS numbers for the most common base oils (Group I ~ V) and core additives (such as ZDDP, detergents, dispersants, etc.) found in engine oil formulations. Whether you want to verify the actual ingredients or are simply interested in the science of lubricants, this table will be a practical lookup tool.
| Category | CAS Number | Description |
|---|---|---|
| Group IV (PAO Synthetics) |
68037-01-4 | 1-Decene, homopolymer, hydrogenated |
| 68649-12-7 | 1-decene Tetramer, Mixed With 1-decene Trimer, hydrogenated | |
| 68649-11-6 | 1-Decene, Dimer, Hydrogenated | |
| 163149-29-9 (and 8002-05-9) |
1-Decene, Homopolymer, Hydrogenated; Polymer of Octene, Decene, 163149-29-9; (8002-05-9), and Dodecene, Hydrogenated; C8, C12 Olefin Polymer, Hydrogenated | |
| 151006-63-2 | 1-Dodecene, Homopolymer, Hydrogenated | |
| 151006-62-1 | 1-Dodecene, Trimer, Hydrogenated | |
| 151006-60-9 | 1-DODECENE, POLYMER WITH 1-DECENE, HYDROGENATED | |
| 163149-28-8 | 1-DECENE, POLYMER WITH 1-OCTENE AND 1-DODECENE, HYDROGENATED | |
| Group III (GTL Gas-to-Liquid) |
848301-69-9 | Distillates (Fischer-Tropsch), heavy, C18-50–branched, cyclicand linear |
| 1262661-88-0 | Distillates (Fischer-Tropsch), heavy, C18-50-branched and linear | |
| Group III (VHVI Hydrocracked) |
64741-89-5 | HIGHLY HYDROTREATED PARAFFINIC BASE OILS |
| 64742-54-7 | HIGHLY HYDROTREATED PARAFFINIC BASE OILS | |
| 64742-55-8 | HIGHLY HYDROTREATED PARAFFINIC BASE OILS | |
| 64742-70-7 | Paraffin oils (petroleum), catalytic dewaxed heavy | |
| 72623-87-1 | Severely Hydrotreated Paraffinic Hydrocarbons (Oil) | |
| 72623-85-9 | Lubricating oils (petroleum), C20-50, hydrotreated neutral oil-based, high-viscosity | |
| 72623-86-0 | Hydrotreated Neutral Oil-Based | |
| 178603-64-0 | Gas oils, petroleum, vacuum, hydrocracked, hydroisomerized, hydrogenated, C15-30, branched and cyclic, high viscosity index; Severely hydrotreated, hydorcracked, hydroisomerized, high viscosity synthetic iso-alkane | |
| 178603-65-1 | Gas oils, petroleum, vacuum, hydrocracked, hydroisomerized, hydrogenated, C20-40, branched and cyclic, high viscosity index | |
| 178603-66-2 | Gas oils, petroleum, vacuum, hydrocracked, hydroisomerized, hydrogenated, C25-55, branched and cyclic, high viscosity index | |
| Group I / II (Mineral Oils) |
64741-50-0 | Distillates, petroleum, light paraffinic |
| 64741-50-5 | Distillates(Petroleum), Light Paraffinic | |
| 64741-52-2 | Distillates, petroleum, light naphthenic | |
| 64742-65-0 | Distillates (petroleum), solvent-dewaxed heavy paraffinic | |
| 64742-55-8 | HIGHLY HYDROTREATED PARAFFINIC BASE OILS | |
| 64742-58-1 | Lubricating oils (petroleum), hydrotreated spent | |
| 64742-56-9 | Distillates (petroleum), solvent-dewaxed light paraffinic | |
| 64742-62-7 | Residual oils (petroleum), solvent-dewaxed | |
| Group V (Esters / Others) |
27178-16-1 | DIISODECYL ADIPATE |
| 16958-92-2 | ESTER SYNTHETIC BASE OILS | |
| 28472-97-1 | di-isodecyl azelate is a diester basestock | |
| 9003-13-8 | Polyalkylene glycol (PAG) | |
| Anti-wear Additives (ZDTP / ZDDP) |
68649-42-3 | ZINC DIALKYL DITHIOPHOSPHATE ZDTP |
| 84605-29-8 | Phosphorodithioic acid, mixed O,O-bis(1,3-dimethylbutyl and iso-Pr) esters, zinc salts | |
| Friction Modifiers (MoDTC / MoDTP) |
68958-92-7 | Moly Dithiophosphate |
| 68958-92-9 | molybdenum di(2-ethylhexyl) phosphorodithioate | |
| Antioxidants | 36878-20-3 | Bis(nonylphenyl)amine |
| 128-39-2 | 2,6-di-tert-butylphenol | |
| Detergents | 61789-86-4 | Calcium petroleum sulfonate |
| 68783-96-0 | Sulfonic acids, petroleum, calcium salts, overbased | |
| 115733-09-0 | Calcium long-chain alkyl phenate sulfide | |
| Dispersants | No CAS | Polyolefin polyamine succinimide, polyol |
| 296-404-1 (EC Number) |
PHOSPHORIC ACID ESTERS | |
| 84605-20-9 | Polyisobutylene succinimide (PIBSI) | |
| Viscosity Modifiers (VM) |
25038-36-2 | Olefin Copolymer |
| 127883-08-3 | Aryl polyolefin, Ethylene/Propylene | |
| Pour Point Depressants (PPD) |
No CAS | POLY METHYL METHACRYLATE ESTER |
| Anti-foam | 63148-62-9 | Polydimethylsiloxane (Silicone oil) |