Mobil 1 Claims to CLEAN Engines. We Put It to the Test.
This is an AI-generated summary of “Mobil 1 Claims to CLEAN Engines. We Put It to the Test.” — a 19 min YouTube video by The Motor Oil Geek, published November 7, 2026. It condenses the full transcript into 10 key takeaways with clickable timestamps.
Summary
This video conducts a bench test experiment to evaluate the cleaning capabilities of three different motor oils—Mobil 1 Advanced Clean, Valvoline Restore & Protect, and Pennzoil Ultra Platinum—by analyzing their effect on used engine pistons, while also discussing other oil performance tests and the complexities of motor oil testing.
Key Points
- The experiment uses used pistons with existing deposits, subjected to controlled time, temperature, and agitation, with the oil being the only variable, to assess cleaning power.
- Each piston was professionally rated before the test using a blind rating system to ensure objective results.
- The test aimed to mimic the conditions of the ASTM Sequence 3H test but was conducted over 168 hours at temperatures up to 150°C.
- Additional tests were performed, including the TEOST Turbocharger Bearing Simulation Test and the PDSC Thermal Oxidation Stability Test, to gauge thermal stability and deposit control.
- Viscosity, ICP, and FTIR tests were also conducted on the oils before and after the main test to identify any significant changes.
- The PDSC test showed Pennzoil Ultra Platinum had the greatest thermal stability, while Mobil 1 Advanced Clean had the lowest deposits in the TEOST test.
- The piston rating results showed slight improvements in cleanliness for all three oils, but these improvements did not directly correlate with the results of the ASTM Sequence 3H engine test.
- Oil analysis revealed that Pennzoil Ultra Platinum had slightly more ester content than Mobil 1 or Valvoline Restore & Protect, and Valvoline Premium Blue Restore (a diesel oil) had the highest ester content.
- Valvoline Premium Blue Restore, a diesel oil with high ester content, demonstrated significant cleaning of carbon from the oil ring on a piston without added heat or agitation, showcasing its cleaning design.
- The video highlights that bench tests are useful screeners but do not always accurately predict performance in real engine tests, emphasizing the complexity and cost of motor oil development and validation.
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