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Old 07-05-2012, 11:32 PM   #202
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What do you guys think of Pennzoil Ultra? According to some guys on BITOG, oil vapor is the major cause of intake valve deposits in DI engines and a low volatility oil is recommended. Pennzoil Ultra 5W-20 seems to have the lowest Noack Volatility - 5.0% (Amsoil Signature is 5.7%)
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