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I change the oil once a year, the filter at 5000 mi. and the bypass filter with the oil. I pull a sample at 15000 mi. I have used Amsoil for years now. I like the fact that as a fulltimer we don't have to worry about looking (and paying) for a place I can trust. The filter is no big deal to me as I just crawl under and never spill any.
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