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The Terminator
Engine/Tuning
Facts About Royal Purple 5W-20 XPR Racing Oil
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<blockquote data-quote="UnleashedBeast" data-source="post: 10444300" data-attributes="member: 112023"><p>It's not that racing oils do not have TBN (total base number - detergent additives) in the oil, it's that there are lower amounts in most formulations that their street version of the oil. Can you use racing oil in your street car, of course you can. Should you normally run it at extended drain intervals like a dedicated street oil, I wouldn't recommend that. </p><p></p><p>It seems that Royal Purple is simply adding more anti-wear and pressure additives to their street oil and calling it XPR. That would explain why it has the same drain interval capacity as their street oils. </p><p></p><p>Amsoil Dominator racing oils do have less TBN than their street oils, but that doesn't mean you can't use it on the street. It just means you don't want to run it as long. Why would a formulator want to waste valuable detergent additives in a racing lubricant when they know the end user will be dumping the oil long before it is due? That's the reason they are normally formulated with lower TBN content. Royal Purple appears to be the exception to the rule, although....they do not list TBN content in their product data sheets anywhere on their website. </p><p></p><p>Amsoil also doesn't list TBN on their Dominator racing oils.</p></blockquote><p></p>
[QUOTE="UnleashedBeast, post: 10444300, member: 112023"] It's not that racing oils do not have TBN (total base number - detergent additives) in the oil, it's that there are lower amounts in most formulations that their street version of the oil. Can you use racing oil in your street car, of course you can. Should you normally run it at extended drain intervals like a dedicated street oil, I wouldn't recommend that. It seems that Royal Purple is simply adding more anti-wear and pressure additives to their street oil and calling it XPR. That would explain why it has the same drain interval capacity as their street oils. Amsoil Dominator racing oils do have less TBN than their street oils, but that doesn't mean you can't use it on the street. It just means you don't want to run it as long. Why would a formulator want to waste valuable detergent additives in a racing lubricant when they know the end user will be dumping the oil long before it is due? That's the reason they are normally formulated with lower TBN content. Royal Purple appears to be the exception to the rule, although....they do not list TBN content in their product data sheets anywhere on their website. Amsoil also doesn't list TBN on their Dominator racing oils. [/QUOTE]
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