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Oilspecialist.com's FAQs

  1. Do synthetics leak more than petroleum oil?
    No, synthetics are not any more prone to leaking than petroleum oils. There is a myth that synthetics are thinner, but an oil that is classified as 10W-40 is the same "thickness" whether it is synthetic or petroleum. This myth originates from the fact that synthetics do not thicken up as fast in the extreme cold range, below zero degrees. Where a petroleum based oil will begin to "gel" up, the synthetic will maintain pourability for a much greater range.

  2. Can I use Amsoil in my high mileage vehicle?
    Yes! Amsoil products are safe for any mechanically sound vehicle. An older engine will benefit from the anti-wear properties of Amsoil just as much, if not more, as a new engine will.

  3. If I use Amsoil motor oils, and then decide to switch back to petroleum oils, will this damage my engine?
    No, Amsoil motor oils are completely compatible with petroleum oil, and will not damage your engine, or "lock" you into using Amsoil. That being said, I don't think you will ever want to switch back after giving Amsoil a try.

  4. I was told that AMSOIL Super Duty Oil Filters are inferior to "Wix (Napa) filters that costs half the price!"  Is there any truth to this?
    In regard to AMSOIL Super Duty Oil Filters being inferior to Wix (NAPA) filters based upon visual inspection, AMSOIL Filters have an inner beauty that's not visible to the human eye. Unlike the person who made these comments, the Society of Automotive Engineers recognized that filter performance cannot be evaluated by visual inspection. Therefore, they created the industry standard SAE HS806 test for evaluating oil filters. The SAE HS806 test evaluates particle removal efficiency and contaminant holding capacity which are the two main functions an oil filter must perform. As you can see from the following charts, AMSOIL outperforms the competition in both areas.





    The Super Duty Filter has a finer filtering media, more dirt holding capacity, heavier-duty construction and a 6-month/12,500-mile change interval recommendation which is the highest in the industry. Change a Wix (NAPA) filter two to three times as often at half the price and it will cost more. There will also be more and larger particles of dirt in your oil at all times if you don't choose the AMSOIL Super Duty.

  5. Should I use after market additives with Amsoil?
    No, Amsoil is formulated to perform at its peak, adding anything to it is not needed, and will likely take away from the quality of the oil. Here is a little more on this subject.

  6. What if I don't want to, or can't change my own oil?
    Not a problem! Almost all quick lubes and service stations will install your AMSOIL synthetic motor oil and filter for you.

  7. Could using AMSOIL void my new car warranty?
    Absolutely not. Vehicle manufacturers recommend using motor oils meeting certain viscosity grades and American Petroleum Institute service requirements. Whether the motor oil is petroleum based or synthetic will not affect warranty coverage. The manufacturer is required to cover all equipment failures it would normally cover as long as the oil meets the requirements and was not the cause of the failure. AMSOIL exceeds these requirements and has never been deemed the cause of the engine's failure. Even so, AMSOIL has its own limited warranty, protecting you even further. In addition, the federally mandated Magnuson-Moss Act states a manufacturer may not require the use of a specific brand of after market product unless it is provided free of charge.

  8. Whats the difference between conventional petroleum oils and synthetic motor oils?
    Conventional petroleum oils are refined from crude oil which is pumped from within the Earth. The refining process, however, does not remove many of the impurities inherent in the crude oil. These impurities detract from the lubricating ability of the oil and contribute to deposit, sludge and varnish formation. AMSOIL synthetic motor oils are constructed in the laboratory and contain no impurities. AMSOIL synthetic motor oils have uniform molecular structure and are designed for specific lubricating applications. They are not as greatly affected by the temperatures or demanding operating conditions of modern engines like petroleum oils are.

  9. How is it possible to drive 25,000 miles without an oil change using AMSOIL?
    AMSOIL coined the phrase "extended drain interval" and it has been validated by more than 33 years of industry testing and by tens of thousands of motorists and billions of over-the-road miles.
    AMSOIL synthetic motor oils provide extended drain performance because they are engineered with the highest quality base stocks and additives on the market today. They don't break down in heat like conventional petroleum oils. AMSOIL motor oils resist formation of performance-robbing deposits, and volatization (burn off). Volatization alters viscosity and increases oil consumption. Finally, AMSOIL uses a superior additive package, a key element in the oil's ability to function. That means AMSOIL holds up under engine stresses, and remains serviceable for the full 25,000 miles with appropriate filter changes.