oneheadlite
Well-known member
- Aug 20, 2015
- 1,795
- 100
...
I will say, I appreciate the fact Costco uses Nitrogen when they mount tires. The properties of the gas are such it doesn't fluctuate with temps like traditional, compressed, ambient air. I never have to adjust the pressure in the tires on my wife's car.
That's interesting. In my experience, the cars that come in to our shop with the green valve stem caps are quite frequently (uniformly) 10+ psi low. I've always attributed it to nitrogen being sold as the "ultimate never need to check your tires" solution, so people never keep up with them.
Do you know if they use pure (bottled) nitrogen to set beads/fill tires when they mount them? My understanding is that if you want the benefits of nitrogen you really need to do it that way (plus pull a vacuum and refill once seated) vs the standard "scrubbed" nitrogen that a lot of shops use. I can't remember the specs of the machine we had at the dealership when I worked there, but the actual final percentage of nitrogen wasn't much higher than ambient air...
The full on Nitrogen fill is more of a racing thing; the machines I've seen in normal shops hook up to the normal compressed air and somehow scrub additional nitrogen. The tires are then deflated and reinflated (usually with full car weight on them) 3 times to boost the nitrogen content.
Full disclosure: outside of my observations when checking tire pressure on cars when I do oil changes, my knowledge base for nitrogen machines used at shops is limited to my exposure back in the day. A quick google shows Costco's nitrogen "shoots for" 93% vs the regular 78 percent ambient. Who knows what the actual normal result is.
Other completed random thing that occurred to me - If I round down and guesstimate that I've averaged 5 oil changes a week, for as long as I've been in the industry I've done over 5200 oil changes in my career. And this is never having worked as a "lube tech".
