Quote Originally Posted by string View Post
None; which is why I'm not making any claims myself.

I have however driven at Wakefield a few times, and know how much extra power a car would require to gain 0.5-1.0 seconds. Energy that would be otherwise dissipated into the thicker oil.

Out of intrest, do you have an oil temperature gauge? And if so, did you notice a difference in the normal temperature of the oil when changing viscosity?
First and foremost, I did not mention power, but response. Something I think is more important than power, especially at Wakefield. Ok maybe 1.0 second is exagerated, but I would honestly say 0.5. Well from my experiences this is true. I am always alot slower using 10W-40 rather than 5W-30 due to the lack of response, 1 - 1.5 seconds (could be other factors though, but the engine response is what kills me the most coming out of corners especially when sliding).

Yes I have an oil temp gauge, but cannot comment on normal temps of oil with different viscosities as they are all on different days, with different tunes.