DFYF-192 Engine Oil Boundary Pumping Temperature Tester (MRV, 9-Station, ASTM D3829 / GB/T 9171)

DFYF-192 Engine Oil Boundary Pumping Temperature Tester (MRV, 9-Station, ASTM D3829 / GB/T 9171)

1. Customer Pain Point + Solution

Pain Point:

For engine oil manufacturers and R&D personnel, low-temperature pumpability is a critical parameter that determines whether an oil can be properly delivered to engine components under severe cold conditions. If the oil cannot be pumped at low temperatures, dry starts, bearing seizure, and even engine failure can occur. Yet many laboratories face persistent challenges in MRV testing: cooling to –40 °C takes too long, limiting daily throughput; temperature fluctuations cause inconsistent results that operators hesitate to report; rotors deform or suffer tip damage within months, with cleaning proving cumbersome; the absence of nitrogen purge leads to unstable data under high humidity; and manual data recording invites transcription errors and audit concerns. How can you measure the boundary pumping temperature of engine oils efficiently and accurately?

Our Solution:

The DFYF-192 Engine Oil Boundary Pumping Temperature Tester (MRV – Mini-Rotary Viscometer) is designed and manufactured in accordance with ASTM D3829 and GB/T 9171. It determines the yield stress and apparent viscosity of engine oils at low temperatures to accurately evaluate boundary pumping performance. The instrument is equipped with an imported brand compressor for rapid cooling, and a fully automatic microcontroller-based temperature control system that maintains accuracy within ±0.1 °C. Its unique 9-test-station design allows more samples to be processed in a single batch. The core rotor is made of alloy material – lightweight, durable, deformation-resistant, and easy to clean. The instrument also features a nitrogen purge (a function absent in most competitors) to prevent sample frosting and oxidation, ensuring data accuracy. Upon test completion, results are automatically printed, meeting ISO 17025 requirements for original data retention.

Customer Value:

You no longer need to tolerate inaccurate data, low efficiency, or cumbersome operation in MRV testing. The DFYF-192 provides a comprehensive solution with dual-standard compliance (ASTM D3829 & GB/T 9171), rapid refrigeration, high-precision temperature control, durable rotors, nitrogen purge, and automatic printing – a pragmatic choice for MRV testing, offering dependable performance at a reasonable cost.

2. Technical Parameters Table

3. Product Highlights

Dual-Standard Compliance – Globally Accepted
The DFYF-192 is designed and manufactured in strict accordance with ASTM D3829 and GB/T 9171, meeting both international and Chinese national standards. Whether your customers are in the United States, Europe, or China, test results are recognised worldwide.

Imported Compressor – Fast, Quiet, Energy-Efficient
The refrigeration system uses an imported brand compressor, offering significant advantages over ordinary units: cooling time from ambient to –40 °C is dramatically shortened; noise levels are lower, improving the laboratory environment; and energy consumption is reduced, lowering longterm operating costs. The heating element is made of stainless steel for safety and corrosion resistance.

Microcontroller-Based Fully Automatic Temperature Control – ±0.1 °C, High Stability
The system employs a microcontroller-based fully automatic temperature control solution. Unlike the simple PID controllers found in many competitors, this ensures excellent temperature stability. The ±0.1 °C accuracy guarantees that every data point is obtained under precisely standard-compliant conditions, making results truly reliable.

9-Test-Station Design – More Samples per Batch
Unlike common 6-station or 4-station designs, the DFYF-192 features 9 test stations, allowing more samples to be processed simultaneously in a single batch. For quality inspection centres and third-party laboratories handling high volumes, this significantly increases throughput and reduces cost per test.

Alloy Rotor – Lightweight, Durable, Easy to Clean
The core rotor is made of alloy material rather than ordinary stainless steel: it is substantially lighter for easier handling; it resists deformation, maintaining geometrical precision over long-term use; the cone tip is more robust and less prone to damage; and cleaning is remarkably simple, saving maintenance time.

Nitrogen Purge – An Exclusive Feature Absent in Most Competitors
The instrument comes standard with a nitrogen purge function that continuously directs dry nitrogen onto the sample surface during testing, effectively preventing frosting and oxidation. This feature is fully compliant with ASTM D3829 and significantly improves the accuracy of yield stress and apparent viscosity measurements – particularly valuable for laboratories in humid regions.

Automatic Printing – Meets ISO 17025 Original Record Requirements
Upon test completion, the instrument automatically prints the results – including temperature, viscosity, yield stress, and other key data – eliminating manual transcription. This prevents recording errors and fully satisfies ISO 17025 requirements for original data retention, simplifying audits.

4. Application Scenarios

Scenario 1: International Lubricant Brand – Full Product Line LowTemperature Performance Verification
An international lubricant brand’s advanced engine oil R&D centre in China uses the DFYF-192 to conduct MRV low-temperature pumpability testing across its entire product range, including 0W-20, 5W-30, and 10W-40 grades. The 9-station design allows simultaneous processing of multiple viscosity grades in one batch, significantly shortening the R&D cycle. The nitrogen purge function ensures data stability even during the humid southern monsoon season. Test results helped the R&D team precisely optimise pour-point depressant and viscosity index improver dosages, ensuring that the full product range meets SAE J300 MRV performance requirements.

Scenario 2: Third-Party Testing Centre – High-Volume Commissioned Testing
A national-level oil testing centre in North China receives over 300 engine oil samples per month for MRV low-temperature performance testing. Using the DFYF-192, the centre nearly doubled its daily testing throughput. The automatic printing feature produces original records directly, eliminating manual transcription and improving efficiency while meeting CNAS requirements for original data management. The imported compressor’s rapid cooling capability enables multiple test batches per day.

Scenario 3: Extreme Cold Region – Oil Adaptability Verification
A lubricant distributor in Northeast China used the DFYF-192 to rigorously verify the low-temperature pumpability of a new winter-grade oil before market launch. During testing at –40 °C, the alloy rotor operated smoothly, and the data precisely revealed the oil’s yield stress and apparent viscosity. Based on the test results, the distributor developed a precise product recommendation strategy that effectively reduced customer cold-start failure complaints in extreme cold conditions.

5. Company Strength – Dalian Analytical Instrument Factory

We don’t just sell instruments. We provide complete testing solutions with 48-hour technical support response and lifetime remote assistance.

6. Certification & Compliance

Standard Compliance: Fully conforms to ASTM D3829 and GB/T 9171

CE Marking: Available upon request (certificate number can be provided)

Calibration Certificate: Each unit comes with a factory calibration report traceable to national standards

7. FAQ – Frequently Asked Questions

Q1: What is the difference between MRV and CCS testing?
A: CCS (Cold Cranking Simulator) testing simulates cranking resistance in the engine crankcase during cold starting, measuring apparent viscosity. MRV (MiniRotary Viscometer) testing simulates the pumpability of oil from the sump to all lubrication points after start-up, measuring both yield stress and apparent viscosity. Both are key parameters in SAE J300 viscosity classification – CCS ensures “it will crank,” and MRV ensures “it will pump.”

Q2: What is the relationship between ASTM D3829 and GB/T 9171?
A: ASTM D3829 is the international standard for MRV testing, while GB/T 9171 is the Chinese national standard, which is technically equivalent. The DFYF-192 fully complies with both standards, making test results mutually recognised worldwide.

Q3: Why is nitrogen purge so important?
A: During low-temperature testing, sample surfaces are prone to frosting (absorbing atmospheric moisture) and oxidation. Both frosting and oxidation alter the actual test state of the sample, leading to data distortion. Nitrogen purge continuously sweeps dry inert gas across the sample surface, effectively excluding moisture and oxygen to ensure that test data truly reflect the oil’s intrinsic properties. Most competitors do not offer this feature.

Q4: What are the advantages of an alloy rotor over a stainlesssteel rotor?
A: The alloy rotor is lighter for easier handling; it resists deformation over long-term use, maintaining precise rotor-stator clearance; the cone tip is more robust and less prone to damage; and its surface properties make oil sample residue easy to remove. These address the common pain points encountered with stainless-steel rotors.

Q5: Can the 9-station configuration test 9 samples simultaneously?
A: Yes. The 9-station design allows up to 9 samples to be tested simultaneously under identical temperature conditions. This significantly increases batch throughput, making it especially suitable for high-volume quality inspection centres and third-party laboratories. All samples are tested under exactly the same temperature conditions, ensuring excellent within-batch data comparability.

Q6: Why is ±0.1 °C temperature control accuracy so critical for MRV testing?
A: Viscosity is highly temperature-sensitive – in the low-temperature region, a 0.1 °C change can cause viscosity variations of tens or even hundreds of mPa·s. The ±0.1 °C accuracy ensures that test conditions strictly meet standard requirements and that data are reliable. If temperature fluctuates, yield stress and apparent viscosity data lose repeatability and reproducibility.

Q7: What is your delivery time?
A: Standard delivery is 20–25 working days after order confirmation. For urgent needs, please contact us to check current stock.

Q8: What is your warranty policy?
A: 12 months from the date of shipment, excluding consumables. Lifetime technical support is included.

8. Test Method Overview – Building Trust Through Transparency

Per ASTM D3829 / GB/T 9171, here is exactly how the DFYF-192 performs the MRV test:

The entire process – from temperature stabilisation to data output – is fully automated by the microcontroller, ensuring consistent test conditions and reliable data.

Summary for Decision Makers

Contact Us

Dalian Analytical Instrument Factory
Carlos Zhang (Overseas Sales Manager)

�� Tel / WhatsApp / WeChat: +86 18740265556
�� Email: 54639288@qq.com
�� Address: 1-1, No.107 Guangxian Road, High-Tech Zone, Dalian, Liaoning, China (Zip code: 116023)

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