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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: 10446177" data-attributes="member: 4360"><p>Thinner oil has less "drag" on the engine, so it theoretically will increase gas mileage (thus the change to the 20wt) and allow the engine to make more power. Don't get your hopes up on power increases, it is probably negligible.</p><p></p><p>As for the heavier oil, when it is run harder and longer, it will tend to shear to a thinner viscosity. Additionally, you are looking at much higher temps when you run at consistent higher RPM's, so the heavier oil will stand up. Most guys can and should run a 30wt for normal use but use a 40wt or even 50wt when racing. </p><p></p><p>There are a bunch of good oil threads in the GT500 forum, but is you want to learn the basics of oil, here is a good start (Bob is the Oil Guy):</p><p></p><p><a href="http://www.bobistheoilguy.com/cms/" target="_blank">Welcome</a></p></blockquote><p></p>
[QUOTE="jrgoffin, post: 10446177, member: 4360"] Thinner oil has less "drag" on the engine, so it theoretically will increase gas mileage (thus the change to the 20wt) and allow the engine to make more power. Don't get your hopes up on power increases, it is probably negligible. As for the heavier oil, when it is run harder and longer, it will tend to shear to a thinner viscosity. Additionally, you are looking at much higher temps when you run at consistent higher RPM's, so the heavier oil will stand up. Most guys can and should run a 30wt for normal use but use a 40wt or even 50wt when racing. There are a bunch of good oil threads in the GT500 forum, but is you want to learn the basics of oil, here is a good start (Bob is the Oil Guy): [url=http://www.bobistheoilguy.com/cms/]Welcome[/url] [/QUOTE]
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