Thread: Anyone using ONLY German Castrol (0W-30) and experiencing N54 carbon buildup ?
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      09-23-2012, 12:26 PM   #6
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Drives: 2007 328i 2011 X5d
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Apparently gm's vvt system eliminates the need for egr, which apparently eliminates the carbon buildup. It passes emissions without it. Apparently.
Toyota has secondary port injection.
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