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Old 03-12-2011, 08:36 PM
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NissanTech NissanTech is offline
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2004 Xterra
Join Date: Jun 2005
Location: California
Age: 50
Posts: 12,407

What is considered high mileage for a switch to a full synthetic? I have wanted to for some time but haven't. Now my Frontier has almost 75K miles on it. Is this too high to switch to a synthetic, and which brand is most favored?
Not at all, you can change to synthetic any time you want. I wrote a post about the synthetic here: Is it ok to switch back and forth between regular and synthetic motor oil?

Mobil 1 is probably the most used, we do more Mobil 1 oil changes at my shop than all the other brands (Eneos, AmsOil, Royal Purple, Valvoline) combine.
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