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Bobby Fazio · 12-09-2020, 11:53 AM

Reviving this thread to ask if anyone has given thought to Viscosity Index? As I understand it, the higher the VI number, the less the oil changes with temperature. In trying to be as consistent as possible in our classes- cold morning runs vs a hot laps, would it make the most sense to run oil with a high VI? I've noticed Royal Purple, Eneos, and Driven have high VI numbers.

I would also extend this question to ATF and Differential as well.

12-09-2020, 11:53 AM	#11
Bobby Fazio VIP Member Join Date: Nov 2009 Location: Egg Harbor Township, NJ Posts: 1,470 Likes: 1,457 Liked 4,379 Times in 502 Posts	Re: What Race Oil do you trust? Reviving this thread to ask if anyone has given thought to Viscosity Index? As I understand it, the higher the VI number, the less the oil changes with temperature. In trying to be as consistent as possible in our classes- cold morning runs vs a hot laps, would it make the most sense to run oil with a high VI? I've noticed Royal Purple, Eneos, and Driven have high VI numbers. I would also extend this question to ATF and Differential as well. __________________ '65 Mustang SS/L & L/SA DriverInterviews.com \| App.DragInsights.com Last edited by Bobby Fazio; 12-09-2020 at 11:59 AM.