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      12-17-2013, 07:39 AM   #21
doc5339
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Drives: 2009 BMW 335d
Join Date: Sep 2012
Location: Charleston, SC

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I also use Opti-Lube XPD, 4oz every other fill-up. I do not notice huge performance gains, but do think the lubricity additive and Cetane boost are important.
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