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Is your dealer a oil expert probably not , anyways do your own research , yes oil filters are the main problem this is why AMSOIL has special filters with NANOTECHNOLOGY that are capable of extended drain usage. I have noticed my car has more power and starts much nicer now using these high tech oils. If been using AMSOIL for years now the price is probably the same or less considering you get 5 times longer miles out of one oil change vs cheap oil , and think of all the time saved too from not having to do all those oil changes , plus it's much better for your cars engine anyways ...
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