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Old 09-21-2015, 09:24 PM
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NissanTech NissanTech is offline
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2004 Xterra
Join Date: Jun 2005
Location: California
Age: 50
Posts: 12,389

Changing to full synthetic oil won't improve the engine performance or restore any engine wear, but if you are planning to drive your Quest a bit hard and you are expecting to change the engine oil after more than 4K miles, then full synthetic oil will help protect the engine of further wear.
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