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Understanding High Zinc Motor Oil

High Zinc Motor Oil

High-zinc motor oil (specifically ZDDP) is crucial for older, classic, and high-performance engines with flat-tappet camshafts to prevent premature valvetrain failure. It creates a sacrificial, anti-wear layer under extreme pressure. While modern cars with catalytic converters require low-zinc oil, using high-zinc oil is essential during engine break-in and for engines with high-load, sliding friction components.

Why High-Zinc Motor Oil Matters

Zinc dialkyldithiophosphate (ZDDP) is an additive that provides crucial protection for engine internals, particularly in high-load situations where conventional oil films might fail. Under extreme heat and pressure, ZDDP acts as a sacrificial barrier, forming a protective layer on metal surfaces that prevents metal-to-metal contact, thus reducing friction and wear. 

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Diesel Fuel Additives

Diesel Fuel Additives

Modern diesel engines are marvels of power and efficiency, but they are also highly sensitive to fuel quality. With the introduction of Ultra-Low Sulfur Diesel (ULSD), fuel lost much of its natural lubricity, and with the rise of High-Pressure Common-Rail (HPCR) systems, the need for cleaner, more stable fuel has never been higher. Diesel fuel additives are no longer just a luxury; they are a critical component for ensuring engine longevity and performance. Among the options available, AMSOIL synthetic diesel fuel additives stand out for their comprehensive, high-quality formulations.

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Maximize Performance and Protection: The Advantages of AMSOIL Synthetic Transmission Fluid

Transmission Fluid

The transmission is often referred to as the heart of a vehicle’s drivetrain, responsible for transferring engine power to the wheels. Yet, it is frequently overlooked until problems arise. Heat, friction, and shear break down conventional transmission fluids, leading to sluggish shifts, excessive wear, and potential failure. For drivers seeking to protect their investment and improve performance, upgrading to AMSOIL synthetic transmission fluid offers a superior, long-term solution. AMSOIL, a leader in synthetic lubrication, engineers its transmission fluids to go far beyond the capabilities of conventional oils, offering significant advantages in heat resistance, wear protection, and shifting performance.

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AMSOIL Synthetic Grease for Your Vehicle

Synthetic Grease

When it comes to vehicle maintenance, grease is often overlooked compared to engine oil, yet it is arguably more critical for preventing component failure. As a semi-solid lubricant, grease acts as a seal against contaminants and stays in place on moving parts—like suspension joints and bearings—where oil would immediately run off

. While conventional grease is functional, the punishing conditions of modern driving—high heat, heavy loads, and water exposure—require superior protection. AMSOIL synthetic greases are engineered to tackle these challenges, providing enhanced longevity and superior performance in the most severe operating environments.

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Conventional and Synthetic Motor Oil Formulation

Magazine Articles

The Anatomy of Motor Oil: Formulation Breakdown 

At its core, motor oil is not just a lubricant; it is a sophisticated chemical mixture designed to protect, clean and cool an internal combustion engine. Whether synthetic or conventional, the recipe is generally divided into two main components: 

  1. Base Stocks (75%–90%): The primary fluid that provides lubrication.
  2. Additives (10%–25%): Chemicals added to enhance base stock performance or add new properties, such as detergents, dispersants, anti-wear agents (like ZDDP), viscosity index improvers, and anti-oxidants. 
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Motor Oil Classifications

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Understanding Vehicle Motor Oil Classifications: Choosing the Right AMSOIL Synthetic

Navigating the world of motor oil can be overwhelming, but selecting the correct oil is the most critical decision for engine longevity. Modern engines are more complex, requiring advanced, high-performance lubricants. Motor oil classifications—set by organizations like the American Petroleum Institute (API), the International Lubricant Standardization Committee (ILSAC), and ACEA—are designed to help you choose the right product.

For 2026 and beyond, superior protection means choosing 100% synthetic, specifically products that exceed the latest API SP and ILSAC GF-6 specifications. AMSOIL synthetic lubricants are designed to not only meet these standards but to consistently outperform them, providing superior protection against engine wear, sludge, and heat.

The American Petroleum Institute (API) uses a two-letter system to define oil performance.

1. API Service Categories (The “S” and “C” System)

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