Under the Microscope: A Day in the Lab with Motor Milk™ 5W-40

At Motor Milk™, we don’t just rely on performance claims; we prove them. This week, our in-house lab team conducted a fresh round of testing on our flagship Motor Milk™ 5W-40 A3/B4 racing motor oil, known for its high SAPS (Sulfated Ash, Phosphorus, Sulfur) and robust ZDDP (zinc dialkyldithiophosphate) anti-wear package. Here’s what a day in the lab looked like—and how our premium oil performed under scrutiny.

The goal was clear: verify key performance metrics under controlled conditions to ensure consistent quality for high-performance and competition-grade engines.

We ran a suite of ASTM-standardized tests on a fresh production batch of Motor Milk™ 5W-40, including:

• Kinematic viscosity at 40°C and 100°C
• Cold Cranking Simulator (CCS) at -30°C
• Pour point and flash point tests
• TBN (Total Base Number) for acid neutralization
• Phosphorus and sulfated ash content

Motor Milk™ 5W-40 passed every test with confidence, hitting or exceeding expected values in all areas:

Test Result Standard/Test Method

SAE Grade 5W-40 SAE J300

Density @ 15°C 854 kg/m³ ASTM D1298

Viscosity @ 40°C 84.1 cSt ASTM D445

Viscosity @ 100°C 14.3 cSt ASTM D445

Viscosity Index 176 ASTM D2270

CCS @ -30°C 6000 mPas ASTM D5293

Pour Point -42°C ASTM D97

Flash Point 215°C ASTM D92

TBN 10 mg KOH/g ASTM D2896

Sulfated Ash ≥1.3% ASTM D874

Phosphorus 1550 ppm ASTM D5185

These figures reaffirm what Motor Milk™ stands for: extreme protection, high thermal stability, and outstanding wear control, even under high-RPM, high-load racing conditions.

• High ZDDP (>1600 ppm) provides a critical layer of wear protection for flat tappet cams and aggressive valvetrain setups.
• Strong TBN (10 mg KOH/g) ensures long-lasting acid neutralization, even with extended drain intervals.
• Excellent cold flow properties (CCS @ -30°C = 6000 mPas) support fast lubrication on startup—vital for protecting precision engine internals.

Whether you’re running laps at the track or pushing limits in a high-performance street build, Motor Milk™ 5W-40 is engineered to meet and exceed expectations.

This testing day was more than routine, it was a reaffirmation of our commitment to racing-grade reliability and premium performance. Every drop of Motor Milk™ 5W-40 is built on lab-verified consistency and real-world endurance.

Stay tuned for more behind-the-scenes testing, customer dyno data, and field results. In the meantime, know that when you choose Motor Milk™, you’re getting oil that works as hard as you do.

Drive hard. Stay protected. Choose Motor Milk™.