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<blockquote data-quote="cachsux" data-source="post: 1272252" data-attributes="member: 5529">You do not have to stick with synthetic but the price is worth it. Fossil (standard) oils do eventually break down, don&#039;t stand up to higher sustained temps, and their viscosity varies (even the multi-viscosity) because of engine temp. Synthetic will withstand much higher temps, it&#039;s viscosity is stable across the heat ranges, and doesn&#039;t break down anywhere near the amount a fossil oil will.With an extended performance oil and it&#039;s accompanying performance filter you could go as high as 15k miles which is what Mobil 1 guarantees their EP oil to hold up. My drive is all highway which is easier on oil and I used to go 5k miles but now I&#039;m using the Mobil products and will take it to 10k miles. I changed my last batch to check it at 7500 miles and it was still amber so I&#039;ll push it to 10k this time.As far as the cost, Autozone by me is running a special for Mobil 1 synthetic with a Mobil 1 filter for $37. That and its extended range more than make it affordable. Especially if you&#039;re going to keep it.</blockquote>

[QUOTE="cachsux, post: 1272252, member: 5529"] You do not have to stick with synthetic but the price is worth it. Fossil (standard) oils do eventually break down, don't stand up to higher sustained temps, and their viscosity varies (even the multi-viscosity) because of engine temp. Synthetic will withstand much higher temps, it's viscosity is stable across the heat ranges, and doesn't break down anywhere near the amount a fossil oil will. With an extended performance oil and it's accompanying performance filter you could go as high as 15k miles which is what Mobil 1 guarantees their EP oil to hold up. My drive is all highway which is easier on oil and I used to go 5k miles but now I'm using the Mobil products and will take it to 10k miles. I changed my last batch to check it at 7500 miles and it was still amber so I'll push it to 10k this time. As far as the cost, Autozone by me is running a special for Mobil 1 synthetic with a Mobil 1 filter for $37. That and its extended range more than make it affordable. Especially if you're going to keep it. [/QUOTE]

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