Similar to many enthusiasts, AMSOIL's primary focus is on maximizing protection rather than just meeting minimum standards. Our approach has consistently involved setting high-quality benchmarks and crafting our products to exceed those standards. This occasionally means choosing not to participate in a licensing program.

A general guideline suggests utilizing AMSOIL High-Mileage Motor Oil when your vehicle approaches approximately 75,000 miles. Although 75,000 miles may not seem like a significant number in today's standards, it marks an optimal moment to fortify your engine with an extra layer of protection as you prepare for future journeys.

Seventy-five thousand miles represents the commonly agreed-upon milestone for initiating a more comprehensive preventive maintenance regimen, aimed at extending the lifespan of the engine to its fullest potential.

If you've been consistently using AMSOIL products from the time your vehicle was brand new or if you've maintained a regular regimen of AMSOIL motor oil, your engine is likely operating at its highest level of performance and has been shielded against wear. However, if you've been using AMSOIL OE Synthetic Motor Oil and are seeking enhanced engine protection as your vehicle ages, switching to AMSOIL High-Mileage Motor Oil is a great decision.

That's right, all AMSOIL motor oils are designed to deliver excellent performance and protection, regardless of the mileage on your vehicle. However, if you're seeking specific advantages at a cost-effective price point for high-mileage vehicles, AMSOIL High-Mileage Motor Oil is the optimal selection. On the other hand, if you want unparalleled performance and protection, irrespective of your vehicle's mileage, our top recommendation remains the Signature Series Motor Oil.

AMSOIL offers two outstanding products tailored to deliver enhanced advantages for high-mileage applications. AMSOIL Synthetic High-Mileage Motor Oil targets the primary issues encountered by high-mileage vehicles while maintaining an affordable price point. On the other hand, Signature Series Synthetic Motor Oil not only addresses all the challenges tackled by AMSOIL High-Mileage Motor Oil but also delivers unparalleled performance and comprehensive protection. When seeking the finest oil option regardless of mileage, Signature Series stands out as the top choice.

AMSOIL High-Mileage Motor Oil provides protection for a duration of up to 15,000 miles or 1 year, depending on which occurs first, under typical operating conditions. If you're using this oil in severe service conditions, please consult your owner's manual for guidance on the recommended oil change interval for such conditions.

While we emphasize the significance of initiating a preventive maintenance regimen with AMSOIL Synthetic High-Mileage Motor Oil at an earlier stage in your vehicle's lifespan, we have not identified a necessity to broaden this particular product category. Continue utilizing AMSOIL High-Mileage or Signature Series Motor Oil to ensure the well-being of your vehicles with over 150,000 miles on the odometer.

While not mandatory, it's worth noting that AMSOIL Oil Filters are purpose-built for extending drain intervals. If you're using filters from other brands, it's advisable not to exceed 12,000 miles or one year, unless your vehicle manufacturer suggests longer intervals. Remember to replace the filter whenever you change the oil.