It should say on the sticker when you open the drivers door I usually run mine at +1psi so 38psi when it comes time to change my oil approx (4,500mi) they are around 36 psi when then weather gets cold you can expect sporadic drops in pressure.
I have the as4 on my 17 gti no issues in Warmer weather their truly confidence inspiring, I do believe colder weather and the chance of black ice can effect you’re ability to truly feel how these tires act.