BITZER BSE32, BSE55, and BSE170 are all refrigeration compressor oils used in BITZER service work, but they belong to different selection paths. BSE32 and BSE55 are POE oils normally checked for BITZER reciprocating compressor applications. BSE170 is a high-viscosity POE oil used in BITZER screw compressor contexts. Before buying an alternative, confirm compressor type, refrigerant, viscosity class, oil history, and warranty status.
This article is written for HVAC technicians, refrigeration service companies, and procurement managers who already know they need a BITZER-related compressor oil but do not want to create a compatibility problem by ordering the wrong grade. It is also a practical companion to our broader BITZER refrigeration oil compatibility guide, which explains the general risk-control process.
The fastest way to reduce ordering risk is to separate the oils by compressor family first. A buyer who only searches for "BITZER compressor oil" may see BSE32, BSE55, and BSE170 on the same product list, but a technician should not treat them as three package sizes of the same lubricant.
| BITZER Oil | Oil Type | Viscosity Direction | Typical Compressor Path | Procurement Caution |
|---|---|---|---|---|
| BSE32 | Polyol ester (POE) | Lower-viscosity POE group | Reciprocating compressor applications where the manual/nameplate specifies BSE32 | Do not upgrade to BSE55 only because the system is old; verify the service document first. |
| BSE55 | Polyol ester (POE) | Higher-viscosity POE group, commonly cross-checked against VG68 POE alternatives for recharge decisions | Reciprocating compressor applications where higher oil viscosity is specified or required by operating conditions | A VG68 POE alternative can be evaluated only when the compressor requirement and supplier data support it. |
| BSE170 | Polyol ester (POE) | High-viscosity POE group | Screw compressor applications where BITZER documentation specifies BSE170 | Do not replace BSE170 with a VG68 oil. It is a different viscosity class and service path. |
In the field, the problem is rarely a lack of product names. The problem is that the product names arrive without the compressor context. A purchasing request may say "need BITZER oil urgently" while the technician note says only "HFC rack, semi-hermetic, top-up required." That is not enough information. The correct order depends on a small chain of facts that must be kept together.
This is why we recommend using the BSE number as the starting point, not the final proof. The number tells you which direction to investigate; the compressor model and operating condition decide whether the oil is acceptable.
BSE32 is the first grade many technicians encounter in BITZER reciprocating compressor service. Its role is not simply "thin oil." It is a specified POE oil path for compressors and operating conditions where BITZER documentation calls for BSE32. In practice, this often means the buyer should preserve the original oil direction unless there is clear evidence that the system has been changed.
Use a BSE32 decision path when the compressor nameplate, service manual, or previous maintenance record points to BSE32. If the unit was originally charged for HFC/HFO service and has no record of conversion, the safest procurement action is to order a BSE32-compatible product and request the supplier's TDS and SDS. A higher-viscosity product may look safer on paper, but it can increase oil return problems if the system was designed around the lower-viscosity grade.
For buyers who need the product route, see the internal product reference: BITZER Refrigeration Oil BSE32.
BSE55 is where procurement questions become more commercial. Many service buyers searching for BSE55 are not only asking "what is it?" They are asking whether a documented VG68 POE oil can be used for recharge or replacement planning when original branded stock is delayed or expensive. That question is legitimate, but it must be handled carefully.
A practical selection rule is this: BSE55 can lead you to evaluate a VG68 POE alternative, but it does not automatically approve every VG68 POE oil. The supplier must show oil chemistry, viscosity data, moisture control, refrigerant fit, and packaging integrity. For Qishanr's own VG68 POE route, start with Qishanr QSL-68H and compare the data against the compressor requirement. For a detailed three-way VG68 comparison, see QSL-68H vs Emkarate RL68H vs CPI Solest 68.
If you are sourcing original BSE55, use the product page here: BITZER Refrigeration Oil BSE55.
BSE170 is the grade most likely to be mishandled by a generic cross-reference table. The name looks like another BSE oil, but the service context is different. BSE170 belongs to the high-viscosity POE path used in BITZER screw compressor applications. The risk is simple: a buyer sees an available VG68 POE oil and assumes it can cover any POE requirement. That assumption is technically unsafe for BSE170 applications.
High-viscosity screw compressor oils are selected for rotor sealing, bearing film strength, discharge temperature exposure, and oil separation behavior. A VG68 oil may be suitable for some compressor families, but it should not be used as a BSE170 substitute unless the compressor OEM documentation and the lubricant supplier both support the decision. When the requirement is BSE170, procure a BSE170 product or request a specific high-viscosity POE cross-reference instead of down-grading the viscosity class.
For the internal product route, use Synthetic BSE170 Refrigeration Oil.
The table below is designed for procurement teams. It does not replace the compressor manual; it tells you what to verify before asking for a quotation.
| Service Scenario | BITZER Grade to Verify | Qishanr Route | Required Check Before Order |
|---|---|---|---|
| Reciprocating compressor, manual specifies BSE32 | BSE32 | BSE32 product route | Confirm refrigerant, existing oil, and whether this is initial fill or service top-up. |
| Reciprocating compressor, higher-viscosity POE path | BSE55 | BSE55 or evaluated QSL-68H VG68 POE route | Compare viscosity data, moisture limit, refrigerant fit, and supplier documentation. |
| Screw compressor, manual specifies BSE170 | BSE170 | BSE170 product route or request a VG170 POE cross-reference | Do not substitute with VG68. Confirm screw compressor series and oil separator conditions. |
| Emergency top-up where original oil is unavailable | Existing oil grade | Ask Qishanr for a TDS/SDS-backed recommendation | Record oil brand, grade, quantity, service date, and residual oil condition. |
The strongest cross-reference request is not "send me a cheaper BSE55." It is a complete technical request that allows the supplier to answer responsibly. Use the following checklist before placing a purchase order.
| Procurement Field | Why It Matters | What to Ask Supplier |
|---|---|---|
| Compressor model | Separates reciprocating and screw oil paths. | "Please confirm the recommended oil grade for this model." |
| Refrigerant | Oil miscibility depends on refrigerant family. | "Is this oil suitable for R134a, R404A, R407C, R507A, or our actual refrigerant?" |
| Oil grade and viscosity | Prevents BSE170/VG68 confusion. | "Provide viscosity at 40°C and 100°C with test method." |
| Moisture control | POE oil is moisture sensitive. | "Confirm sealed packaging and maximum moisture content." |
| Service status | Initial charge, top-up, and full oil change have different risk levels. | "Can this product be used for our intended service mode?" |
No. BSE32 and BSE55 are both BITZER-related POE oil grades, but they are not the same viscosity direction and should not be treated as interchangeable. Use the grade specified by the compressor manual, nameplate, or service record.
No. BSE170 is a high-viscosity POE path for screw compressor applications, while BSE55 is normally evaluated in a reciprocating compressor service path. Replacing BSE55 with BSE170 can create circulation and oil return problems unless the OEM documentation specifically supports that change.
QSL-68H can be evaluated as a VG68 POE candidate where the compressor requirement, refrigerant, operating conditions, and service mode support a VG68 POE alternative. It should not be described as BITZER-approved unless written OEM approval exists. Use it as a data-backed cross-reference candidate, not a blind substitute.
BSE170 sits in a high-viscosity oil path. A VG68 POE oil is much lower in viscosity direction and may not provide the rotor sealing, bearing film, or oil separation behavior required by a screw compressor designed around a BSE170-type lubricant.
Request the technical data sheet, safety data sheet, viscosity at 40°C and 100°C, moisture control statement, refrigerant compatibility statement, packaging information, batch identification, and supplier recommendation for the exact compressor model.
Start with oil chemistry and compressor type. HFC systems generally require POE oil, but the correct viscosity still depends on whether the compressor is reciprocating, scroll, screw, or centrifugal. For refrigerant-side background, read the HFC refrigerant oil compatibility guide and the POE oil vs mineral oil comparison.
If the purchase request says BSE32, BSE55, or BSE170, do not reduce it to "BITZER oil." Keep the grade, compressor type, and refrigerant together. For BSE32, follow the lower-viscosity reciprocating compressor path. For BSE55, evaluate the higher-viscosity POE path and, where appropriate, compare VG68 options such as QSL-68H. For BSE170, keep the selection in the high-viscosity screw compressor path.
For technical confirmation, samples, or a documented quotation, contact Qishanr with the compressor model, refrigerant, oil grade, current oil history, and required packaging volume.
