This guide explains the commercial categories buyers commonly encounter when evaluating base oils. Final selection must be based on the current product documents, additive system, finished-lubricant target and laboratory validation.
VIEW BASE OILSBase Oil Groups
Group I
Solvent-refined mineral base oils commonly evaluated where viscosity, solvency and finished-product economics must be balanced.
Group II
Hydroprocessed mineral base oils commonly evaluated for improved saturation and oxidation-performance requirements.
Group III
Higher-refined mineral base oils used in suitable formulations after grade and performance verification.
Group IV PAO
Synthetic polyalphaolefin base stocks available in multiple viscosity grades for appropriate formulation work.
Group V Esters
Other synthetic base stocks, including ester families, evaluated for specific formulation functions and compatibility.
Bright Stock
High-viscosity base stock evaluated for suitable heavy-lubricant and grease applications, subject to current data.
How Buyers Compare Grades
- Viscosity and viscosity index
- Flash point, pour point and volatility where relevant
- Solvency, oxidation-performance tendency and additive response
- Finished-lubricant target and laboratory test program
- Current TDS, SDS and batch COA
- Packaging, quantity, destination and trade term
Core Procurement Pages
SN150 · SN500 · Group II 150N · Group II 500N · Bright Stock 150
Related Comparisons
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Identify the grade and intended application so the team can provide the appropriate current information.
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