Hello. I recently for just a 2023 NX350. My previous car was an Audi Q5 2015, and if I used Costco gas, I had problems with the improper mixture alarm. What is your experience using Costco gas in the Lexus NX350 2023? Is it okay and have you had any problems?

 

Costco gas has the "Top Tier" designation, so you should be able to have complete confidence in it.
I've been using it almost exclusively in several cars for quite a few years and have never had a problem.

 

Absolutely correct. Top tier and $.35 a gallon less then other top tier stations.

 

I have been using only Costco gas ever since I got my NX two years ago, been using their 94 till few month ago when the prices went thru the roof, I started using their 87, still no issues, yet

 

Ditto to everything mentioned already. I did a road trip last year and felt like there was a degradation of performance the one time I filled up with non Top Tier gas. Could have been all in my head but I've been using Costco gas for for a couple of decades without issues and a lot of savings relative to other stations. On the rare occasions I do have to fill the tank when on the road, I try to find a station that sells Top Tier gas.