What oil should I use for using Nitrous?

I have been using 5w-30 Mobil1 since I owned my Cobra. I have been running nitrous on it for about 5 years. There are 95,500 miles on it...a lot of them 1/4 mile at a time... Any thoughts of going to a heavier weight, or a different brand??? And why???:Track:
 
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