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Synthetics
I've used synthetics in my car for at least 5 years (Click and Clack show some years back recommended it)--and most especially when the vehicle reaches around 80K miles or so. 5K on the oil changes (again, Click and Clack from 5-6 years back) seems to be about right; as I drive mostly highway. Run a good oil additive and you should be fine every 50K or so and you should be fine.
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