Base Oil (Group I / II / III)
The lubricant feedstock behind engine oils, industrial lubricants and greases — refined to API Group I, II or III specification for finished-lubricant formulation.
Chelora Chemicals supplies API Group I, II and III base oils to lubricant blenders worldwide, with viscosity-grade matching and full documentation.
Product identity
- CAS Number
- 64742-65-0 (Group II, representative)
- Classification
- API Group I / II / III base stock
- Viscosity index (VI)
- 80-90 (I) / 80-120 (II) / 120+ (III)
- Density
- 0.84-0.88 g/cm³
- Sulfur content
- >0.03% (I) / ≤0.03% (II, III)
- Saturates content
- <90% (I) / ≥90% (II, III)
- UN Number
- Not regulated
- HS Code
- 2710 19
Note: CAS numbers vary by specific base-oil grade and refining route; confirm the exact grade and CAS with our technical desk for your order.
What Base Oil is used for
Base Oil is the refined mineral lubricant base stock produced from the vacuum-distilled, heavier fractions of crude oil, processed to one of three API classifications: Group I (conventional solvent-refined, lower purity, the traditional commodity grade), Group II (hydroprocessed, higher saturates content and lower sulfur, now the dominant grade in many markets), and Group III (severely hydrocracked and hydroisomerised, delivering synthetic-like performance at mineral-oil cost, used in premium and synthetic-blend lubricants).
Base oil's sole function is as the feedstock for finished lubricant formulation — blended with additive packages (detergents, dispersants, antioxidants, viscosity modifiers) into automotive engine oils, industrial lubricants, hydraulic fluids, greases, metalworking fluids and marine lubricants. Group selection is driven by the performance tier, oxidative stability and viscosity-index requirements of the finished lubricant specification.
Where it sits in the petrochemical value chain
- Crude Oil (Vacuum Distillate) the source material, vacuum-distilled and refined into base-oil grades.
- Base Oil (this product) the lubricant feedstock for the finished-lubricant applications below.
- Finished Lubricants the downstream blended products — engine oils, industrial lubricants, greases.
Handling character
Base oil has low acute toxicity and is not classified as an acute hazard under normal handling, though it is combustible and used oil/mist exposure should be controlled. Full handling detail is in the Safety section below.
| Parameter | Typical value |
|---|---|
| Appearance | Pale yellow to colourless oily liquid |
| Viscosity grade | Confirmed against your formulation (e.g. 150N, 500N, 4cSt, 6cSt) |
| Sulfur content | Group dependent |
| Pour point / flash point | Grade dependent, confirmed at order |
Important: the figures above are indicative of commercial material and are offered for planning only. The batch certificate of analysis is the governing document.
| Property | Value |
|---|---|
| Physical state | Pale yellow to colourless, oily liquid |
| Viscosity index (VI) | 80 to 120+ (Group I to III) |
| Density | 0.84-0.88 g/cm³ |
| Saturates content | <90% (Group I); ≥90% (Group II/III) |
| Sulfur content | >0.03% (Group I); ≤0.03% (Group II/III) |
| Flash point | > 200 °C (combustible) |
Physical constants compiled from public reference data for CAS 64742-65-0 and rounded for readability. Treat them as orientation, not as a specification.
Where our customers put Base Oil to work
The refined feedstock behind every finished automotive and industrial lubricant.
Automotive engine oils
Blended with additive packages into passenger-car and heavy-duty engine oils across all three groups.
- Group I / II / III specification
- Bulk & drum supply
- Technical desk review on request
Industrial lubricants & hydraulic fluids
Formulated into industrial gear oils, hydraulic fluids and compressor lubricants.
- Industrial-grade specification
- Documented batch traceability
- Contract & spot supply
Greases
Thickened with soap or specialty thickeners into automotive and industrial greases.
- Full analytical documentation available
- Retained sample held against the lot
Metalworking fluids
Formulated into cutting, grinding and forming fluids for metal fabrication.
- Documented batch traceability
- Technical desk review on request
Marine & specialty lubricants
Formulated into marine engine lubricants and other specialty lubricant applications.
- Research & process-scale quantities
- Full documentation supplied
Contract & scheduled supply
Lubricant blending plants running continuous consumption are supported with scheduled bulk delivery.
- Annual contracts with scheduled call-off
- Price held across the contract period
- Second source held in reserve
How we supply Base Oil (Group I / II / III)
Chelora Chemicals is a supplier and sourcing partner, not a manufacturer. Group selection and viscosity grade are critical to finished-lubricant performance tier — that shapes how we manage this line.
We place your order with whichever qualified producer best matches your required grade, your price point and your delivery window, and confirm your jurisdiction's import requirements before booking.
We keep a second qualified source on this line, so a single-plant disruption never becomes your production problem.
- Group and viscosity grade confirmed before we quote. Consistency matters to finished-lubricant performance tier and additive compatibility.
- Technical documentation matched to your formulation. COA data (VI, pour point, flash point, sulfur) confirmed before booking.
- Scheduled call-off scheduling. We hold contracted tonnage and release it against your consumption calendar.
- Batch traceability to the producing refinery. Full chain of custody documentation on request.
- Export machinery handled in-house. Classification, approved packing, labelling, freight booking and customs paperwork are ours to manage.
- Group I, II and III all sourced. Matched precisely to your finished-lubricant specification.
Packed the way your plant receives it
Drum, tote or bulk tank — tell us your preferred format and we will quote and arrange it.
200-210 litre drums
Steel drums for smaller-volume orders and trial quantities.
~1,000 litre totes
Returnable or one-way IBC totes sized for mid-volume blender orders.
Large-volume bulk shipment
ISO tank or flexi-tank bulk shipment for continuous-consumption lubricant blending plants.
Incoterms to suit you
Quoted on the Incoterm your purchasing team works to, with documentation filed before booking.
Trial / sample quantities
Small packs dispatched for formulation trials before a commercial order is placed.
Contracted call-off supply
We hold contracted tonnage and release it against your consumption calendar.
Low acute hazard — standard precautions apply
Base oil has low acute toxicity and is not classified as an acute hazard under GHS for normal handling, though it is combustible and mist/aerosol exposure should be controlled. The summary below is orientation only — the safety data sheet supplied with your specific batch is the authoritative document.
Classified hazards
Not classified (acute)Fresh base oil is not classified as an acute GHS hazard at typical exposure.Mist/aerosol noteProlonged inhalation of oil mist should be avoided per standard industrial hygiene practice.Combustible noteCombustible liquid; keep away from high-temperature ignition sources.
Low-risk but not risk-free. Avoid prolonged skin contact and inhalation of oil mist; always read the SDS issued with your specific batch and grade.
Storage
Store in tightly closed containers in a cool, dry area away from strong oxidising agents and high-temperature ignition sources.
Handling
Standard gloves and eye protection are sufficient for normal handling. Control oil mist generation during high-speed processing per standard industrial hygiene practice.
Transport
Not classified as dangerous goods for transport. We confirm any destination-specific import documentation your shipment requires.
Every batch, documented
We verify documentation before dispatch so there are no surprises at your incoming-goods bench.
Specification agreed
Group, viscosity grade, VI and sulfur content confirmed against your formulation requirement before order placement.
Producer/refinery batch testing
The producing refinery tests each batch against the agreed specification before release.
Documentation review
COA, SDS and transport paperwork checked by our desk before the shipment is booked.
Traceable dispatch
Each shipment is traceable to its producing refinery, with full chain-of-custody records on request.
How Base Oil is made
Base oil is produced from the vacuum-distilled heavy fractions of crude oil, refined by one of three processing routes: solvent refining and dewaxing (Group I, the traditional and least-processed route), hydroprocessing (hydrotreating/hydrocracking) for higher saturates content and lower sulfur (Group II), or severe hydrocracking combined with catalytic hydroisomerisation for the highest viscosity index and oxidative stability among mineral oils (Group III).
We do not publish operating process parameters here; this is background only. Full technical documentation accompanies every shipment, and any process-specific detail you need is best confirmed directly with our technical desk.
| Chemical family | Refined mineral hydrocarbon (lubricant base stock) |
|---|---|
| Functional groups | Mixture of saturated paraffinic and naphthenic hydrocarbons (varying aromatic content by group) |
| Reactivity | Chemically stable base for additive-package blending; oxidative stability improves from Group I to III |
| Related compounds | Crude Oil (source), Paraffin Wax (co-product of dewaxing) |
Explore the wider petrochemical range
Base Oil (Group I / II / III), answered
What is Base Oil used for?
How is Base Oil made?
Is Base Oil hazardous?
What grade do you supply?
What packing do you offer?
Do you manufacture this yourself?
Get a quote on Base Oil (Group I / II / III) today
Send us your required grade, pack size and delivery window. We will come back with a firm quote, lead time and full documentation.