Nitrogen in tires

[landrovered]

I have noticed that some synthetic oil has a foil top under the cap and some does not. I would not put it past a few parts stores that have fallen on hard times to put dino oil in place of the much pricier synthetic. I need to study the brands and I will post which has foil and which does not.

[ericinca]

I had my last set of tires replaced and filled with nitrogen at no extra charge by the car shop. Since it was no big deal, I didn't have an opinion one way or another. I have been in the habit of checking my tire pressure and re-inflating my tires every two months over the last year.

Since then, I have noticed that my nitrogen-filled tires hardly lose any pressure compared to the tires on my BMW which are air-filled, which tends to lose 2-3 psi every two months (on the same checking interval).

FWIW, it seems the nitrogen filled tires are definitely having a positive impact.