Buick Regal Forum : 2011 Buick Regal Forums - View Single Post - What brand of oil would you use for your Regal?
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post #12 of (permalink) Old 03-14-2012, 04:01 PM Thread Starter
Join Date: Jun 2010
Posts: 90
I used to use Royal Purple but I heard bad things about them plus it caused a knock in my engine. Now I use Castrol too.
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