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Amsoil does state their oils are supreme and can run for longer time periods with the proper filtration...one way to compat expenses (for a DIY'er) is to drain a quart and then add a quart (or so) every 3-5k miles along with changing the filter. This would keep the oil quality pretty consistant whilst being cheaper than a full blown oil change.
Amsoil is expensive, but lots of other companies say they can go for longer intervals too. I've got Napa 10w30 in my Accord now...but I'm going to get Amsoil for the engine and tranny next time...
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