Got an email from a Joe Gibbs
oil aficionado. He pointed out to me that Joe Gibbs racing
oil touts itself as being full compatible between the different flavors of itself. Even gave me this link:
http://www.joegibbsracingoil.com/tra...or-Which-15946
Quote:
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XP1, XP2, XP3, XP6, and XP0 are based on the same lubricant technology and are completely compatible. Please download our blending chart for blending specifications.
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Brad Penn probably takes the same position.