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Open Track Racing
Suggestions on track day cooling/oil
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<blockquote data-quote="MFE" data-source="post: 12418828" data-attributes="member: 36397"><p>I spent a LOT of time studying the Product Data Sheets for a variety of oil brands and weights, and learning more about what the data is all about, and I send my oil to Blackstone for analysis every time I change it. IMHO, 5w30 is way too light for hard, hot track day use. But I guess it depends on whose oil it is. To me, one of the more useful data points is "HTHS Viscosity @150C", which is the High Temperature/High Shear test, which measures the ability of the oil to maintain a decent viscosity under the conditions it might find at a crank bearing on a hot race track, and the higher the number, the better. Unfortunately, HTHS is inversely proportional to fuel economy, and if I remember correctly, somebody correct me if i'm wrong, but HTHS vs light viscosity is why BMW mandated a very specific and very expensive engine oil for some of their higher-strung cars: It was the only one that could be low enough viscosity for their fuel economy requirements while still exceeding their HTHS requirements. </p><p></p><p>Anyway, I run Redline 15w/50, because my engine builder set mine up a little on the "loose" side knowing exactly how I'd be using it. I've run as light as 10w/40 on the track, but I sometimes see oil temps as high as 270F and I prefer the viscosity wiggle-room I get out of the 50-weight oil. </p><p></p><p>In redline's case, the HTHS of 15w/50 is 5.8 and 10w/40 is 4.7. Their 5w/30's is 3.8. </p><p></p><p>I'm not trying to sell anyone on Redline in particular, but do your research. For comparison, Mobil 1's 5w/30 HTHS is 3.1 and the religious-nut AMSOIL 5w/30 is 3.2</p><p></p><p>There's more to oil than HTHS...do some digging, and when in doubt, for track use, go heavier.</p><p></p><p>And no, I wouldn't bother changing the oil after every track day.</p></blockquote><p></p>
[QUOTE="MFE, post: 12418828, member: 36397"] I spent a LOT of time studying the Product Data Sheets for a variety of oil brands and weights, and learning more about what the data is all about, and I send my oil to Blackstone for analysis every time I change it. IMHO, 5w30 is way too light for hard, hot track day use. But I guess it depends on whose oil it is. To me, one of the more useful data points is "HTHS Viscosity @150C", which is the High Temperature/High Shear test, which measures the ability of the oil to maintain a decent viscosity under the conditions it might find at a crank bearing on a hot race track, and the higher the number, the better. Unfortunately, HTHS is inversely proportional to fuel economy, and if I remember correctly, somebody correct me if i'm wrong, but HTHS vs light viscosity is why BMW mandated a very specific and very expensive engine oil for some of their higher-strung cars: It was the only one that could be low enough viscosity for their fuel economy requirements while still exceeding their HTHS requirements. Anyway, I run Redline 15w/50, because my engine builder set mine up a little on the "loose" side knowing exactly how I'd be using it. I've run as light as 10w/40 on the track, but I sometimes see oil temps as high as 270F and I prefer the viscosity wiggle-room I get out of the 50-weight oil. In redline's case, the HTHS of 15w/50 is 5.8 and 10w/40 is 4.7. Their 5w/30's is 3.8. I'm not trying to sell anyone on Redline in particular, but do your research. For comparison, Mobil 1's 5w/30 HTHS is 3.1 and the religious-nut AMSOIL 5w/30 is 3.2 There's more to oil than HTHS...do some digging, and when in doubt, for track use, go heavier. And no, I wouldn't bother changing the oil after every track day. [/QUOTE]
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