Oil & Gas
CRS PLUS supplies Group I solvent-neutral base stocks and Group III hydrocracked base oil in bulk, with Group II, Group IV, bright stock, naphthenic and re-refined grades sourced on request, from a qualified supplier base of refiners and terminal operators. CFR terms are available to Mediterranean, Red Sea and African ports. Each quotation carries the supplying refinery’s datasheet, and each parcel ships with its certificate of analysis.
Three grades account for most enquiries. The full range sourced on request is listed further down.
A light solvent-neutral Group I base stock — the lower-viscosity cut of the SN range. Blended where a thinner finished oil is required, or used to trim SN 500 down to a target viscosity.
Typical use: Lighter engine oils, cutting and rolling fluids, viscosity trim in multigrade blends.
The most widely traded Group I grade. A heavier distillation cut than SN 150 from the same solvent-refining route, and the backbone of most conventional engine oil, hydraulic and industrial blends.
Typical use: Conventional engine oils, anti-wear hydraulic fluids, gear and compressor oils, greases.
A severely hydrocracked and hydroisomerised base stock. Higher viscosity index, very low sulphur and low volatility against a Group I stock of comparable viscosity — the grade behind most low-viscosity, long-drain and synthetic-claim formulations.
Typical use: Low-viscosity and long-drain engine oils, synthetic and semi-synthetic blends.
The five API 1509 base stock categories. These are the published industry definitions that every grade on this page falls under — not a supplier specification.
| Group | Process | Saturates | Sulphur | Viscosity index |
|---|---|---|---|---|
| Group I | Solvent refined | Less than 90 % | Greater than 0.03 % | 80 – 120 |
| Group II | Hydrotreated | Greater than 90 % | Less than 0.03 % | 80 – 120 |
| Group III | Hydrocracked / hydroisomerised | Greater than 90 % | Less than 0.03 % | Greater than 120 |
| Group IV | Synthesised | Polyalphaolefins (PAO) | — | — |
| Group V | Various | All other base stocks — naphthenic, esters, PAG | — | — |
SN 150 and SN 500 are the light and heavy cuts of the same solvent-refined Group I stream. Group III is a different product altogether — hydrocracked rather than solvent refined, with a substantially higher viscosity index and far lower sulphur.
| Property | SN 150 | SN 500 | Group III 6 cSt |
|---|---|---|---|
| API group | Group I | Group I | Group III |
| Refining route | Solvent refined | Solvent refined | Hydrocracked / hydroisomerised |
| Viscosity | Light cut | Heavy cut | Light, held to a tight 6 cSt target |
| Viscosity index | Conventional | Conventional | High — above 120 by definition |
| Sulphur | Conventional Group I level | Conventional Group I level | Very low — below 0.03 % by definition |
| Low-temperature behaviour | Moderate | Moderate | Good — low pour point and volatility |
| Typically blended into | Lighter engine oils, cutting fluids, viscosity trim | Conventional engine oils, hydraulic, industrial, greases | Low-viscosity and long-drain engine oils, synthetic blends |
Sourced through the same qualified supplier base. Listing does not indicate stock held by CRS PLUS — availability, origin and lead time are confirmed per enquiry, and every quotation states the certificate of analysis that governs the parcel.
| API group | Process | Grades | Notes |
|---|---|---|---|
| Group I | Solvent refined |
| The conventional solvent-neutral range from light to heavy cuts, plus bright stock for high-viscosity industrial and marine blends and greases. |
| Group II | Hydrotreated |
| Specified where a Group I stock cannot meet the oxidation-stability, volatility or colour limits of a formulation. |
| Group III | Hydrocracked / hydroisomerised |
| The basis of most formulations marketed as fully synthetic. |
| Group IV | Synthesised |
| Fully synthetic base fluid for extreme-temperature and long-drain applications. |
| Group V and speciality | Various |
| Naphthenic stocks for transformer oils, process oils and low-pour applications; re-refined stock for cost-driven industrial blends. |
No specification figures are published here, because CRS PLUS sources from several refiners and each issues its own datasheet. Every quotation is accompanied by the supplying refinery’s technical datasheet, and every parcel ships with a certificate of analysis reporting the parameters below against the stated test methods. The certificate governs the material supplied.
| Parameter | Test method |
|---|---|
| Appearance | Visual |
| Colour | ASTM D 1500 |
| Density @ 15 °C | ASTM D 1298 / D 4052 |
| Kinematic viscosity @ 40 °C | ASTM D 445 |
| Kinematic viscosity @ 100 °C | ASTM D 445 |
| Viscosity index | ASTM D 2270 |
| Flash point (COC) | ASTM D 92 |
| Pour point | ASTM D 97 |
| Total acid number | ASTM D 974 |
| Sulphur content | ASTM D 4294 |
| Saturates (Group II / III) | ASTM D 2007 |
| Noack volatility (Group III) | ASTM D 5800 |
SN 500 with an SN 150 trim remains the standard Group I combination for conventional monograde and multigrade engine oils. Group II or III is specified where a low-viscosity, long-drain or higher-tier formulation is required.
SN 500 forms the bulk of anti-wear hydraulic fluids, gear oils, compressor oils and general industrial circulating oils across the ISO VG range. Group II is used where oxidation stability limits are tighter.
SN 500 and bright stock are the usual carriers for lithium and calcium soap greases, with the SN 150 cut used to adjust base oil viscosity to the target NLGI consistency.
Naphthenic stocks are specified for electrical insulating oils and rubber process oils. SN 150 and lighter cuts are used in cutting and rolling fluids where a lighter, lower-colour stock is preferred.
Both are solvent-refined Group I base stocks produced by the same process; the difference is the distillation cut. SN 150 is the lighter grade and SN 500 the heavier — the SN number derives from the Saybolt viscosity of the cut. SN 500 carries a higher flash point and density, SN 150 a lighter colour and slightly higher viscosity index. In practice blenders use SN 500 as the base of a formulation and SN 150 to trim the finished viscosity downward. The exact figures for either grade are those on the supplying refinery’s datasheet and certificate of analysis.
Group III base oils are severely hydrocracked and hydroisomerised rather than solvent refined. Under the API 1509 definition they carry more than 90 % saturates, less than 0.03 % sulphur and a viscosity index above 120, against a Group I stock’s conventional viscosity index of 80–120 and higher sulphur. That allows formulations with longer drain intervals and lower viscosity grades, which is why Group III underpins most oils marketed as fully synthetic.
Group II base oils are hydrotreated rather than solvent refined, giving more than 90 % saturates and less than 0.03 % sulphur at a viscosity index of 80–120. They are specified where a Group I stock cannot meet the oxidation-stability, volatility or colour limits of a formulation — typically in higher-tier engine oils, turbine oils and long-life hydraulic fluids. The common Group II grades are N70, N100, N150 and N500.
Naphthenic base oils have a low pour point, good solvency and low wax content, which suits them to transformer and electrical insulating oils, process oils for rubber and printing inks, metalworking fluids, refrigeration compressor oils and greases that must remain pumpable at low temperature. They are sourced against the specific application, since viscosity grade and aromatic content vary widely across the naphthenic range.
CRS PLUS sources base oil from several refiners and terminal operators, and each issues its own datasheet. Publishing one set of figures would misrepresent the material actually supplied on a given enquiry. Instead, every quotation is accompanied by the supplying refinery’s technical datasheet, and every parcel ships with a certificate of analysis reporting the parameters listed above against the stated test methods. That certificate governs.
Base oils are classified under HS heading 2710.19 — petroleum oils other than crude, in the lubricating oil and preparation range. The eight- and ten-digit sub-heading varies by destination country, so the applicable code should be confirmed against the tariff schedule of the importing market before shipment. CRS PLUS issues commercial documentation against the code confirmed for each destination.
Supply is in bulk by metric ton. Flexitank and 1 MT flexi-bag packing are both available, as are drums where a destination requires them. Typical lot sizes run from a single 20-foot flexitank load up to multi-hundred-ton parcels.
CRS PLUS sources each grade from its qualified supplier base of refiners and terminal operators across the Middle East and Asia. Origin is confirmed per enquiry, since the most competitive source varies by grade, quantity and destination. Ex-tank, ex-works and CFR terms are available, with CFR quoted to most Mediterranean, Red Sea, East and West African ports.
A structured offer follows within 72 hours.