I don't think that there is an issue with mixing organic oil.   Penzoil & I think Quaker State sell an oil that is a mixture.    There may be an issue with mixing brands that use different additives, but that issue applies to organic oils also. 

On 9/8/06, Larry Shouse <[EMAIL PROTECTED]> wrote:
My business partner just started using synthetic oil in his car. Considering the oil change intervals, there is a real possibility of having to add oil before it's time to change the oil.
 
My question - when you add a quart, are there any concerns about mixing brands, or adding a quart of organic by mistake?
 
Thanks,
Larry



--
Rick Schaefer
72 TPI El Camino

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