Oil Analysis Results....
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I run mine 15k miles then I change the filters, run it another 15k miles and change oil and filters. So I do 30k miles oil changes. I know if I did oil analysis I could go longer between changes, but I don't have time for that. Its also a peace of mind thing and I want my engine to go a million miles without having to go into it.
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I was going too, but I got a better price on the Delvac and it's more readily available to me since we sell it. I get it for about $7.00 buck a quart which is also cheaper then the amsoil.