Sponsored by The Tire Rack

[Bayern1]

Hey guys, any opinions on that? My local BMW dealer had it advertised on their website. 70 $ for a fill.

[sjg111]

http://www.e90post.com/forums/showthread.php?t=395298

I wouldn't do it. $70 sounds a little excessive and air is already 78% nitrogen anyway.

[mildon77]

only if you really like green caps on your valve stems.

Air we breath is about 78 percent nitrogen, 20 percent oxygen, 2 percent inert gases. Deffinately not worth paying for.

[blacknbean]

costco fills it for free at their tire center. the only differnce would be the psi would remain more constant. but really you would only notice if you were on a track. not worth paying money for.

[Bayern1]

Thanks for the info. Will stick with air.

[sy2767]

scam.......nuf said.

[Wingman335]

Originally Posted by apache335

Hey guys, any opinions on that? My local BMW dealer had it advertised on their website. 70 $ for a fill.

That is a complete rip off for $70. If they do it for free (as Costco does it), go ahead. But I wouldn't pay any money for it, much less 70 bucks! My dealership charges $99 for nitrogen with every new car- once I raised a concern, they took the charge away. You can get a decent air compressor for that money.

[galahad05]

Originally Posted by apache335

Hey guys, any opinions on that? My local BMW dealer had it advertised on their website. 70 $ for a fill.

Ask them if they pump out the existing air in the tires first.

[drummer12]

I know a place around here that does it for free. Kept my air pressure very constant in my last car. Thing is, if you get low (like I do with the run flats), you'd have to get it refilled with nitrogen, else you defeat the benefits.

The free nitrogen place is a little ways away, so I just said the hell with it and bought a compressor from Amazon

[CPWINCH]

Originally Posted by mildon77

only if you really like green caps on your valve stems.

Air we breath is about 78 percent nitrogen, 20 percent oxygen, 2 percent inert gases. Deffinately not worth paying for.

Mine did it for 50, they dont use the green caps anymore just keep it on record and they refill them for free after u pay for it.

[hipnotic]

stick with air

[boostd92]

My dealership sells it for $40/lifetime fill. Nitrogen or not, your TPM light will continue to come on if the weather changes more than 30 degrees or so between TPM resets.

It's definitely frustrating having to defend the "consistant tire pressure" myth that Nitrogen retailers spread when more than half my customers have nitrogen, and still have pressure drops on leak-free tires with temperature change.

As mentioned before... the air you breath is more than 70% nitrogen, taking that last bit out isn't going to make a measurable difference.

[ScaredOnce]

Originally Posted by galahad05

Ask them if they pump out the existing air in the tires first.

This. It's not much of a benefit unless your filling the tire in a vacuum. But, I suppose this may have other unintended effects on the rubber compounds in the tire.

When I bought my G8GT new, they wanted $250 for the "dealer N2" option. I asked them to remove that option and take the N2 back. They "threw it in" then and eventually admitted BS.

[a4moda]

I have heard, that Costco provides nitrogen fill ups. This information may be dated however, so you can call into your local Costco repair garage and ask if they in fact do perform Nitro fillups.

GL

[Lenaxia]

I pay to get more oxygen, ha!

In my scuba tanks.... 120cf tanks with 32% oxygen for $6 yeaaaah~

[dghdgh]

Nitrogen remains constant through out the temprature range so you should get a minimal increase in mpg as the tyre pressure will remain constant. Not sure if its worth that amount of hard earned cash thou.
If you do get it done the tyres should be de flated nitrogen filled de flated then filled with nitrogen again. Normal air contains water in very small amounts which expands and decreases as it heats up the nitrogen should remove this very slight change in tyre pressure and reduce the need the for seasonal changes in tyre pressure.
For free grab it to pay think about it.

[galahad05]

Nitrogen, like oxygen, argon, hydrogen, and every other basic gas, closely approximates what is called the Ideal Gas Laws, or equations of state.

If you want details, google it.

Takeway: you increase temperature, you increase pressure; you decrease temperature, you decrease pressure. Both proportional to the temperature change. All with the volume (of the tire in this case) remaining the same.
This is true of any gas. Including oxygen. Including nitrogen.

Nitrogen and every other atomic gas will both raise and lower pressure just about the same.


Now, what you nitrogen proponents should have been talking about was how consistently nitrogen raises and lowers pressure with temperature. It's all about how "dry" it is compared to air. Water vapor/humidity differences cause slightly uneven pressure changes in tires filled with air. This is why race teams went to nitrogen: they wanted to be able to predict tire pressure changes with greater accuracy during a race.

[tomz17]

Originally Posted by galahad05

Now, what you nitrogen proponents should have been talking about was how consistently nitrogen raises and lowers pressure with temperature. It's all about how "dry" it is compared to air. Water vapor/humidity differences cause slightly uneven pressure changes in tires filled with air. This is why race teams went to nitrogen: they wanted to be able to predict tire pressure changes with greater accuracy during a race.

Listen to this man... forget the other BS snake oil you've heard about nitrogen (MPG, "smaller molecules", oxidation, etc.). This is the ONLY reason you want nitrogen over air, and it's not a particularly compelling reason. If you have to pay any money for it just use regular air!


// amazed by the success of this nitrogen bullshit... I want to start a business filling tires with helium and argon... My marketing will tell people that the argon is inert, and therefore better for your car. Furthermore its larger size means that it won't diffuse out of the tire as quickly! The helium is also inert, but also almost FOUR TIMES lighter than nitrogen... so it will obviously be superior for gas mileage and the environment (shhh!)... and the really stupid rich schmucks can even get my special Helium-3 fillup!

[a4moda]

I smell a successful business filling tires up with Hydrogen.

Originally Posted by tomz17

Listen to this man... forget the other BS snake oil you've heard about nitrogen (MPG, "smaller molecules", oxidation, etc.). This is the ONLY reason you want nitrogen over air, and it's not a particularly compelling reason. If you have to pay any money for it just use regular air!


// amazed by the success of this nitrogen bullshit... I want to start a business filling tires with helium and argon... My marketing will tell people that the argon is inert, and therefore better for your car. Furthermore its larger size means that it won't diffuse out of the tire as quickly! The helium is also inert, but also almost FOUR TIMES lighter than nitrogen... so it will obviously be superior for gas mileage and the environment (shhh!)... and the really stupid rich schmucks can even get my special Helium-3 fillup!

[Thud]

Originally Posted by dghdgh

Nitrogen remains constant through out the temprature range so you should get a minimal increase in mpg as the tyre pressure will remain constant.

Nitrogen does NOT make tire pressure remain constant. It just makes it more predictable because the pressure/temp curve will be closer to the Ideal Gas Law.

It's mainly useful for race cars and space shuttles. For the rest of us... it's a good way to stimulate the economy I guess, by donating $70 to your tire shop.

[bbbradley]

$70?? Holy crap!!! IMO for free I'd do it, but I wouldn't pay anything for this service. Waste of money.

[R12ax7]

$70!? No way - do it if its free (like it is at Costco), but dont pay for that ish

(ha I didnt even read your response until i posted mine bbbradley...good form though)