Brad Penn oil

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Yes, in my 65 Mustang. Their 10w30 semi syn racing oil "green" oil seems to be the classic cars owner's choice. Have also used their API rated passenger car oils in the past. Their HDEO 15w40 might be one of the stoutest oils out their in that category based on their specs.
 
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Who makes Joe Gibbs? I tried it in a engine I was dinoing once for a customer .Did ok but very pricey!!
 
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