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Buyers new to base oil sourcing often face a critical dilemma: does their formulation require SN150 or SN500? Ordering the incorrect base oil viscosity grade wastes valuable capital and delays production schedules. Whether you are blending automotive lubricants or industrial fluids, understanding the distinct characteristics of these grades is essential.
In this guide, we provide a head-to-head comparison of base oil SN500 vs SN150. By breaking down their properties, typical applications, and common blending practices, you will be equipped to make a confident, technical decision before requesting a quote from our Base Oil hub.
What “SN” Means
Before diving into the comparison, it helps to briefly clarify the terminology. “SN” stands for Solvent Neutral, which is the standard industry designation for a base oil group I product refined through a solvent extraction process. The number following the “SN” (such as 150 or 500) corresponds to the approximate kinematic viscosity measured in Saybolt Universal Seconds (SUS) at 100°F.
For a complete breakdown of solvent extraction and foundational concepts, read our full article on What Is Base Oil and How Is It Used in Lubricant Manufacturing?.
SN150 — Properties and Typical Uses
SN150 is characterized by its relatively lower viscosity. Because it flows more freely, particularly at moderate to lower temperatures, it is a staple in formulations that require rapid oil circulation and immediate lubrication upon machinery startup.
In the market, SN150 is heavily favored as a primary base stock for lighter automotive engine oils, hydraulic fluids, and general-purpose industrial lubricants. If you are producing lubricants that prioritize efficient flow and heat dissipation over thick film strength, SN150 is typically your starting point. Explore its specific use cases in depth in our guide on Base Oil SN150 Applications in Industrial and Automotive Lubricants.
SN500 — Properties and Typical Uses
On the heavier end of the Group I spectrum sits SN500. This grade boasts a significantly higher viscosity, meaning it resists flow more than SN150 and leaves a much thicker, more robust lubricating film on metal surfaces. This characteristic makes it highly suitable for high-temperature and high-load environments where a lighter oil would thin out and fail to protect machinery.
Typical SN500 applications include heavy-duty industrial gear oils, marine lubricants, and high-stress mechanical fluids. Furthermore, it is a vital blending stock used to “thicken” lighter oils to create high-viscosity multigrade engine lubricants. You can find detailed technical parameters in our breakdown of Base Oil SN500 Specifications and Export Grades from Iran.
SN500 vs SN150 — Side-by-Side Comparison
When choosing between base oil SN500 vs SN150, evaluating their attributes side-by-side provides the clearest perspective for procurement and formulation teams.
Feature | SN150 (Solvent Neutral 150) | SN500 (Solvent Neutral 500) |
Viscosity Profile | Light-grade, lower viscosity, higher fluidity. | Heavy-grade, higher viscosity, robust film strength. |
Typical Applications | Light motor oils, hydraulic fluids, textile oils, general machinery lubricants. | Heavy-duty gear oils, marine lubricants, compressor oils, high-temp applications. |
Typical Blend Partners | Blended with SN500 or SN600 to increase final viscosity. | Blended with SN150 or SN100 to reduce final viscosity. |
Relative Cost | Subject to market, often slightly cheaper due to higher refinery yields. | Subject to market, generally commands a slight premium over lighter grades. |
When Buyers Blend SN150 and SN500 Together
In modern commercial lubricant manufacturing, an off-the-shelf single viscosity grade rarely meets the complex requirements of today’s multigrade standards. Because of this, base oil blending is a standard industry practice.
By blending the cold-flow properties of SN150 with the high-temperature stability and film strength of SN500, manufacturers can dial in the exact kinematic viscosity required for multigrade engine oils (such as 15W-40 or 20W-50). If you are looking to formulate specific grades, refer to our comprehensive Base Oil Blending Guide: Combining SN150 and SN500 for Target Viscosity.
How Petrobon Can Help
At Petrobon, we remove the friction from bulk chemical and petroleum procurement. Whether your production lines demand virgin stocks or high-quality recycled alternatives, we supply reliable, export-ready SN150 and SN500 base oils.
We ensure that every order is backed by a verified Certificate of Analysis (COA), allowing your technical team to verify specifications and blend with absolute confidence.
Frequently Asked Questions (FAQ)
Can SN150 and SN500 be used interchangeably?
No. Their distinct viscosity ranges make them suitable for entirely different mechanical environments. Substituting a light grade for a heavy grade (or vice versa) will drastically compromise the performance and protective qualities of your finished lubricant. You can, however, combine them to reach a middle ground, as detailed in our blending guide.
Which grade is used in automotive motor oil?
The answer depends entirely on the target finished viscosity. Lighter passenger car motor oils lean heavily on SN150, whereas heavier multigrade oils for older or heavy-duty engines require SN500. In practice, the two are frequently blended together alongside specific additive packages to meet SAE viscosity standards.
Is one grade cheaper than the other?
Market prices for base oils fluctuate continuously based on crude oil benchmarks, regional refinery output, and global demand. Generally, heavier grades like SN500 may command a slight premium due to the energy and complexity involved in refining them, but this is not an absolute rule. We recommend contacting our commercial team directly for the most accurate and up-to-date spot pricing.
