if its infiniti warranty, i would go for it. i purchased my car used too but it was CPO.
I have got my center console replaced for squeaking, driving seat bottom replaced for leather bubbling and several more, free of cost.
it depends but to me it paid itself off several times.

 

I bought infiniti Wrap (CPO inspected) on mine for $2900, Warranty has covered both headlights( moisture) passenger side axle, both speakers in drivers door in the 2 years I have owned it. Was worth every penny IMO.

 

I am in the same boat. Just bought a 2013 G37, 45k miles. Car seems to run fine. However I used a credit union for finance. They offered me 60 month 100K miles for $1,200. I declined with an option to purchase later......

 

Thanks for all the replies. Ended up getting an Infiniti Elite plan. Already I am needing to make a warranty claim because when my wife sits in the passenger seat the passenger airbag off light comes on.