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All oils thin out as they get hotter and thicken as they cool. The difference between a 30 and 40 weight oil is very little. Looking at the High Temp Sheer (HTHS) of the oil is also a good indicator of the oil's performance at very high temps. Some good article (same one but one's easier to read)http://www.ferrarichat.com/forum/faq.php?faq=haas_articleshttp://www.bobistheoilguy.com/motor-oil-101/For track use, a 0 or 5W 30 or 40 is a good ballpark.
All oils thin out as they get hotter and thicken as they cool. The difference between a 30 and 40 weight oil is very little. Looking at the High Temp Sheer (HTHS) of the oil is also a good indicator of the oil's performance at very high temps.
Some good article (same one but one's easier to read)
http://www.ferrarichat.com/forum/faq.php?faq=haas_articles
http://www.bobistheoilguy.com/motor-oil-101/
For track use, a 0 or 5W 30 or 40 is a good ballpark.
