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I have read that many people don't give synthetic oil a long enough go when they first start. The oil consumption will go way up for ~5k miles but then settle back down again.
You're spending way more money on oil than you need to. There have been some studies (by Ford and Sunoco I think) that showed that changing your oil before 6000 miles is a real waste. Based on their studies the oil rapidly degrades over the first ~5000k miles but then barely changes at all until sometime well after 6000k miles. There were some folks who saw similar results from their own extensive test which they posted online:
http://neptune.spacebears.com/cars/stories/oil-life.html
results:
http://neptune.spacebears.com/cars/stories/mobil1.html
Their test was with Mobil 1 but I'm pretty sure the Ford test was with conventional. A quick search didn't turn up and links to the Ford test. Either way most people are changing their oil much too early and wasting money and precious environmental resources, and polluting needlessly.
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1998 V70 AWD->FWD Turbo 200k+
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