Summary of Formulation System Proportions

• Total base oil content: 25%[█████████░] (Dot notation: ●●●●●●●●●○)
• Total additive content: 75%[█░░░░░░░░░] (Dot notation: ●○○○○○○○○○)
• Formulation completeness: 00%[██████████] (Compliance rating: ★★★★★)

  3. Key Physicochemical Indicators and Comparison

  📊 Core Indicator Dashboard 🌡️ Kinematic Viscosity at 100℃: 10.78 mm²/s ── [ PASSED ] 🟢 (Spec range: 7.00 ~ 11.00 mm²/s) ❄️ Brookfield Viscosity at -40℃: 64,701 mPa·s ── [ PASSED ] 🟢 (Spec requirement: ≤ 150,000 mPa·s) ⚙️ 100℃ Viscosity after KRL Shear Test: 10.03 mm²/s ── [ PASSED ] 🟢 (Complies with SAE 80 viscosity retention requirement) 📈 Viscosity Index (VI): 166 ── Excellent 🟢 🔥 Open Cup Flash Point (OCFP): 180 ℃ ── 📌 Reference only

  Dynamic Test Data and Standard Comparison Table

  Test Item	Test Condition	Reference Standard	Measured Result	Status Judgement
  Kinematic Viscosity (KV40)	40℃	📌 Recording reference	61.93 mm²/s	[ PASSED ]
  Kinematic Viscosity (KV100)	100℃	7.0 ~ 11.0 mm²/s	10.78 mm²/s	✅ Compliant
  Viscosity Index (VI)	—	📌 Recording reference	166	📈 Favorable
  Flash Point (OCFP)	Open cup method	📌 Recording reference	180 ℃	🟢 Normal
  Brookfield Viscosity	-40℃	≤ 150,000 mPa·s	64,701 mPa·s	✅ Compliant
  100℃ Viscosity after KRL Shear	Post shear test	Within SAE 80 range	10.03 mm²/s	✅ Compliant

  Viscosity-Temperature Response and Shear Attenuation Profile

  1. Viscosity-Temperature Response Trend: -40℃ (64701 mPa·s) ──(↘ Sharp decline)──> 40℃ (61.93 mm²/s) ──(↘ Gentle decline)──> 100℃ (10.78 mm²/s)Dynamic trend thumbnail: █ ▅ ▂ (Indicates viscosity decreases smoothly with rising temperature, presenting a mild viscosity-temperature curve)
  2. KRL Shear Stability Attenuation Chain: Fresh oil: 10.78 mm²/s ──(↘ Viscosity reduction: 0.75 mm²/s / -6.96%)──> Post KRL shear: 10.03 mm²/sViscosity retention rate: 04% [█████████░] (★★★★☆)

  4. Objective Evaluation of Technical Data

  1. High-temperature Viscosity Performance (Kinematic Viscosity at 100℃)
  • The measured kinematic viscosity at 100℃ is 78 mm²/s, locating at the upper-middle section of the SAE 80 viscosity grade range (7.00 ~ 11.00 mm²/s).
  • The viscosity index (VI) reaches 166, demonstrating favorable lubricating film retention capacity and resistance to high-temperature viscosity thinning for this formulation.
  2. Low-temperature Flow Performance (Brookfield Viscosity at -40℃)
  • SAE 75W specification stipulates the Brookfield viscosity at -40℃ shall not exceed 150,000 mPa·s.
  • The measured value of this sample is 64,701 mPa·s, equivalent to 43.1% of the upper specification limit (Safety margin indicator: [████░░░░░░]). It proves that the formulation delivers excellent cranking flowability and pumpability under frigid conditions.
  3. Shear Stability (KRL Test)
  • After KRL shear test, the 100℃ kinematic viscosity drops from 10.78 mm²/s to 03 mm²/s, with a viscosity reduction rate of 6.96%.
  • Post-shear viscosity remains steadily within SAE 80 specification (≥ 7.0 mm²/s). No obvious shear-induced viscosity thinning is observed, satisfying long-term anti-shear protection requirements for gear components.
  4. Comprehensive Conclusion
  • This GL-4 75W/80 formulation passes all three core evaluation dimensions: general physicochemical properties, low-temperature flowability and shear stability. It achieves good indicator matching with authentic and reliable overall performance data, fully complying with relevant specifications.

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