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I have a set of wheels and tires originally off of a Roush 428R and i need to top off the tire pressure. Are these tires filled with nitrogen or plain 'ol air? And if it is nitrogen, can I add regular air to top em off?
Air is actually ~80% nitrogen, so you will be fine. I had nitrogen in my tires, but then I moved and none of the dealerships had nitrogen so I just used regular air.
I just had mine filled with nitrogen at the dealer because they screwed a few things up, and i cant really tell a difference. Also my valve caps are blue
If their filled with nitrogen it should have a green or blue valve cap, yes you could use air if nitrogen not avalible, their is another thread with nitrogen air debate it works for me in Fl.