<VV> Synthetics Oil GM Engineer's Opinion (long)

[J R Read_HML]

Why?  Define "hurt".
Later, JR

----- Original Message ----- 
From: "John Lewis" <johnl at sfcn.org>
To: <virtualvairs at corvair.org>
Sent: Tuesday, July 08, 2008 8:12 PM
Subject: <VV> Synthetics Oil GM Engineer's Opinion (long)


> does it hurt an engine to change back to natural oil after running
> full synthetic?
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