Tony Hwang wrote:

> jim beam wrote:
>
>> Tony Hwang wrote:
>>
>>> Hi,
>>> Just wondered what if topping up with ordinary air to a nitrogn filled
>>> tires. What would happen? Good, bad or any harm?
>>
>>
>>
>> not a problem. the question is, why did you bother with nitrogen in
>> the first place?
>
>
> Hi,
> Wife had new tires put on at Costco and they only use nitrogen.
> When I took the car to a lube joint for oil change they are not gonna
> bother with tire pressure check because of nitrogen(green valve cap).
>

Since air is mostly nitrogen anyway, you will just end up with less
nitrogen in the mix, which was probably not 100% nitrogen to begin with,
because the tires would have had some air in them before inflation.