Olefin Copolymer (OCP) Viscosity Modifier
Olefin copolymer (OCP) viscosity modifier — the cost-effective workhorse VM for engine oils, offering excellent thickening efficiency and good shear stability across a range of grades.
The workhorse viscosity modifier for engine oils
OCP is the most widely used viscosity modifier in engine oils — cost-effective, with excellent thickening efficiency and a range of shear-stability grades to suit different oils.
Olefin copolymer (OCP) is the workhorse viscosity modifier of the engine oil industry. Made from ethylene-propylene copolymer, it offers excellent thickening efficiency (giving good multigrade performance economically) and is available in a range of shear-stability (SSI) grades to match the durability each oil needs. It is the cost-effective standard for passenger car and heavy-duty engine oils, where it provides the viscosity-temperature performance multigrade oils require. It is part of the viscosity index improver range and contrasts with the premium PMA and shear-stable HSD types.
Olefin Copolymer (OCP) Viscosity Modifier — typical properties
Representative typical values for OCP viscosity modifier. Indicative only — exact values vary by grade and are confirmed on the TDS and batch COA.
| Property | Typical Value | Method / Note |
|---|---|---|
| Appearance | Solid bale, liquid concentrate, or pellets | Grade-dependent |
| Polymer type | Ethylene-propylene copolymer | OCP |
| Thickening efficiency | Excellent | OCP strength |
| Shear stability (SSI) | Range of grades | Match to oil |
| Kinematic viscosity (100°C) | Grade-dependent | ASTM D445 |
| Form | Bale / liquid / solid | Various |
| Function | Viscosity modifier | Engine oils |
Typical values for guidance only — not a specification. Request the TDS for the specific grade you need; the COA reports actual measured values for your batch.
Where OCP viscosity modifier is used
Passenger Car Engine Oils
The standard VM for multigrade PCMO. See engine oil additives.
Heavy-Duty Diesel Oils
Cost-effective thickening for diesel oils. See diesel engine oil.
Multigrade Oils
Provides the viscosity-temperature performance multigrade oils require.
Cost-Effective Formulations
Economical thickening efficiency for mainstream oils.
Why formulators choose OCP viscosity modifier
Excellent thickening efficiency
Economical multigrade performance — reach viscosity targets cost-effectively.
Range of SSI grades
Choose the shear stability the oil needs, from economy to high-durability.
Industry workhorse
The most widely used VM in engine oils, proven and versatile.
From sample drum to ISO tank
Sinolook supplies OCP viscosity modifier at any scale, from formulation samples to commercial bulk, to over 60 countries.
Other viscosity index improvers
Explore the rest of the viscosity index improver range:
Frequently asked questions
What is an olefin copolymer (OCP) viscosity modifier used for?
Why is OCP the most common engine oil VM?
What is shear stability (SSI) in a viscosity modifier?
How does OCP compare with PMA and HSD?
Can Sinolook provide TDS, MSDS and COA?
Request OCP viscosity modifier from Sinolook
Tell us your target grade, application and volume — we'll send the TDS, a batch COA and a delivered quotation within 24 hours.
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