I bought my used mustang gt a couple months ago an I just was alerted of low tire pressure on my dash. Im pretty sure its due to the recent drop in temperature. But I do have the green caps an I was wondering if anyone has these an where they get their tire pressure topped off. Also if it costs at all. Im hoping I could just go to the Ford dealer.

 

I had it done at my local tire shop and they said anytime they were low to bring it by and they would top it off for free . but I assume that's because I had it done there. That said , I stopped using it since my tires seemed to go down the same amount with the nitrogen as it did with air , and since I check my pressure each month it's easier to top it off with air at home than to go somewhere to have it done ...

 

Thanks for the info. So I can still use air? Will combining both affect the life of my tires?

 

Nitrogen shouldn't change with the temperature. That's why they use nitrogen. If they are low you should have a leak. Air pressure fluctuates with temperature where as nitrogen might only change 1/2 a pound from 0degrees to 100degrees.

Find what tire is low and check for leaks.

 

I use nitrogen when I'm at the dealership and they change my tires

 

same here. I bought mine used and they put nitrogen in them. Havent had to top off or anything, but was wondering if mixing with air would casue any issues.

 

some good info here

http://www.tirerack.com/tires/tirete...jsp?techid=191

My lincoln when new had it in there from the dealer I let it all out and went back to good old regular air. I'm not going to argue which is better but what is easier to get for me like stated already. I have a compressor and I didn't feel like tying myself to a dealer for air.

 

My passenger rear tire ended up being about 3 psi lower then the required 30 psi. That could of been the case because someone before I owned the car put regular air in it and it changed with the temperature. Who knows, could be a very small leak as well. I just had them top it off with air but fortunately the dealer I bought the car from has nitrogen.

 

No, mixing will not harm the tires just the nitrogen. Nitrogen contains no moisture, it is the moisture content of compressed air that causes tire pressures to expand when hot and contract when cold. Supposedly if the air is vacuumed out of the tire and replaced with nitrogen, the pressure when set will be the same - period no adjustment need unless there is a leak in the tire itself.

 

Nitrogen is the way to go, my car is almost a year and half old, never added any more and the same with our Challenger.. So the last time I went and got my free oil change at the Ford Dealer(birthday Freebyat the dealer) had them fill the 2006 also and no more air ups!

 

Sorry, but this information is unfortunately false. Nitrogen pressure changes with temperature the same as air does. Air is composed of 78% nitrogen, so the vast majority of pressure change with air is due to the nitrogen. A change of 100F is equivalent to 55C. Pressure is proportional to temperature in Kelvin, where 273K = 0C, and a change of -1 deg K is the same as -1C. 100F = 37C = 310K, so a 55C/K drop in temperature will give a 17% drop in pressure.

If it's free great, otherwise it is not worth the $$$ shops want to charge.

 

0.o that's funny because that's not what they teach in school...

 

I don't worry about nitrogen or oxygen in my tires, I just make sure that I have the correct seasonal air in my tires!

 

You know, never mind. I just don't know enough about this subject, so I deleted mah post. Sorry.

I like this article, though: http://www.popularmechanics.com/cars...stions/4302788

It talks about water and pressure, and... I can see how water in the tire could swing pressures more/less... but...

 

from tire rack

• Nitrogen is a gas and is still affected by changes in ambient temperature (about one psi for every 10° Fahrenheit). Nitrogen filled tires will require pressure be added during the fall/winter months as ambient temperatures and tire pressures drop. Nitrogen is good but can't change the laws of physics.
• Nitrogen reduces the loss of tire pressure due to permeation through rubber over time by about 1/3. This helps maintain the vehicle's required tire pressures a little longer, but doesn’t eliminate the need for monthly tire pressure checks. This is good for people who don’t maintain their vehicles well.
• Nitrogen is non-corrosive and will reduce oxidation and rust due to the absence of oxygen and moisture. This will help minimize wheel corrosion to promote better bead sealing. Tires that are used routinely will be replaced long before any life benefit would be received by using Nitrogen. This is most beneficial for drivers who drive their vehicles infrequently (car collectors, track drivers, snow tire users, motor home owners, etc).
• Nitrogen is a dry gas and will not support moisture that could contribute to corrosion of the tire’s steel components (bead, sidewall reinforcement and belts) due to the absence of moisture over extended periods of time. However it’s important to remember that atmospheric pressure is constantly pushing oxygen and moisture into the rubber from the outside of the tire. This is especially good for low mileage drivers who don't wear out their tires quickly or those that run average annual mileages but use long wearing radial (60K and 80K warranted) tires.
• Nitrogen assures more consistent pressure increases due to increases in operating temperatures in a racing environment because of the absence of moisture. This is especially good for participants in track days, high-performance drivers education schools and road racing.
• Drivers should use standard air if pressure adjustments are required when a local source of nitrogen can’t be found during a trip. While this reduces the benefit of higher nitrogen content, it is far better than running the tires underinflated in search of a source. Often the original nitrogen provider will refill the tires for free or a nominal cost when the driver returns to his hometown.

 

Not sure where you went to school, I hope they weren't "teaching to the test".

Ideal Gas Law

 

Well it was more of the instructor was rambling on. I should go bet him 20 bucks now

 

I have Nitrogen and with 2700 miles on the car I had to get about 7 lbs in each tires last weekend. I think the ride is better. I have had Nitrogen in my past 5 cars and havent had a problem.

 

I use helium in mine to make the car lighter.

 

I recently purchased Conti DWS Extreme and the Ford dealer gave me free nitrogen. So far so good not sure if it the tires or the nitro but it handles much better so i am betting on the tires. No loss of pressure with about 1500 miles on them