I'm going to add my speculation that adding MoS2 may actually strengthen the steel meshed headgaskets used by Toyota and prolong it's lifespan. I won't be changing my headgasket until the oil data show it's time to change (if ever). AI response to moly used to coat steel in general: "Applying a molybdenum (moly) coating to steel, or alloying steel with molybdenum, significantly improves its heat resistance, high-temperature strength, and creep resistance. Molybdenum acts as a "workhorse" element that allows steel to retain its structural integrity and hardness at high temperatures, often up to 530°C–650°C (1200°F+) for specific chrome-moly steels. How Molybdenum Enhances Heat Resistance: Increased High-Temperature Strength: Molybdenum improves the creep limit—the ability to resist deformation (stretching) over time under constant stress at high temperatures. Reduced Softening: Unlike carbon steels that lose strength above ~400°C, molybdenum inhibits softening and keeps the steel tough. Microstructure Stabilization: Moly slows down the agglomeration and coarsening of carbides at high temperatures. It forms stable carbides that strengthen the grain structure. Improved Corrosion/Oxidation Resistance: Molybdenum contributes to the formation of a stable passive film, preventing oxidation and corrosion in high-heat environments. Key Applications: Chrome-Moly Steel: Widely used in power plants, oil and gas, and petrochemical industries for its ability to handle high-temperature and high-pressure environments. Aerospace & Automotive: Used for engine parts, turbine blades, exhaust systems, and brake discs. Tool Steel: Molybdenum-based tool steels (M-series) resist softening at high-speed cutting temperatures. While molybdenum is often added into the steel during the manufacturing process for the best structural results, specialized thermal spray coatings of molybdenum are also applied to improve surface wear and high-temperature performance. "
How often are you going to add, would it be better just to use an oil that has a higher Molybdenum level?
Motor oil that already has it should do fine. Valvoline Restore & Protect motor oil has it and has 5 star reviews on Amazon. It claims to "restore" the engine and protect it from future wear. Check if the one you use has it. Valvoline Restore & Protect Full Synthetic 0W-20
