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The Terminator
Engine/Tuning
Facts About Royal Purple 5W-20 XPR Racing Oil
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<blockquote data-quote="jrgoffin" data-source="post: 10444575" data-attributes="member: 4360"><p>Adding to all this, the racing oils also have higher levels of Phosphorus and Zinc in them, which is supposedly not as conducive to longer catalyst life. The new SM standard has the Zinc & Phosphorus levels limited to 0.9% and 0.8% respectively which translates to 900ppm & 800ppm. </p><p></p><p>As an example, the M1 5w30 has the Zn & P levels of 900 & 800, whereas their Racing 0w30 has them at 1850 & 1750. Not sure about RP, but many of the top of the line synthetics (Amsoil, Redline, etc.) have those levels up around 1500+ as well.</p></blockquote><p></p>
[QUOTE="jrgoffin, post: 10444575, member: 4360"] Adding to all this, the racing oils also have higher levels of Phosphorus and Zinc in them, which is supposedly not as conducive to longer catalyst life. The new SM standard has the Zinc & Phosphorus levels limited to 0.9% and 0.8% respectively which translates to 900ppm & 800ppm. As an example, the M1 5w30 has the Zn & P levels of 900 & 800, whereas their Racing 0w30 has them at 1850 & 1750. Not sure about RP, but many of the top of the line synthetics (Amsoil, Redline, etc.) have those levels up around 1500+ as well. [/QUOTE]
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