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    recommended drain interval for Amsoil w/filter

    recently switched from royal purple 10w30 to amsoil engine - 95 GM LT1 350, 82k miles oil - amsoil 10w30 filter - amsoil sdf25 driven ~20k per year in florida what would you guys recommend for my drain interval? [ September 14, 2003, 01:21 PM: Message edited by: got_hp? ]
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