When to replace shocks?
 

Almost 47k miles on a '10 driven on NYC roads with stock suspension. Been wondering when I should be looking to replace the shocks/springs (most likely going coilovers, or maybe just replace the shocks). It's hard to tell just how much the ride has degraded over time but I'm going to guesstimate that it feels close to how it did from day 1. Also, what is the general interval of when springs start to go, as well? There's no sag in ride height as far as I can tell.

General rule of thumb is start paying attention at around 60K. That doesn't mean replace them at 60K. Quality springs are good for a while, such as the stock units. 150k or so give or take.

When ride height starts to drop, or the ride gets rough, or you hear a lot of extra road noise, like squeaking. I'm over 225k and still haven't changed my OE suspension, but I do need to. LOL The car just looks lowered now about 3/4-1"

you should replace the shocks and springs now. i've replaced with oem shocks twice with gently used units but i should have just replaced them with konis or gone with coilovers

Op admit to yourself your just justifying so you can upgrade to coilovers! Lol
Oem shocks should last more than 60k miles unless you really have bad roads in NY.
Besides there are multiple suspension parts you need to look into such as ball joints and upper and lower control arm bushings, tie rod bushings which I think wears out faster than Oem shocks and springs.

Good to hear that they can last a while longer. I try to keep the mod bug away but it always comes back when I check to see what's new on the forum. Coilovers is just going to lead to camber arms, sway bars, etc. The roads in NYC are quite horrendous, but you develop an eye for dodging as many imperfections in the road as possible. Of course there are some where you're going to miss seeing or can't avoid. I've already had 2 rear wheels develop an inch long crack, as well as a front wheel lip being bent outwards. On top of that, the Borla catback sits only 3.25" off the ground on stock height. It's already flattened out quite a bit, so any thoughts of lowering makes it mandatory to switch out the exhaust if I don't want to scrape holes into the exhaust.

I don't know if it still applies but we used to do a Q&D check by bouncing the car and seeing how fast it damped out. Push down on a fender until the car is moving up and down as much as you can get it to move. Release fender. Count how many times the car cycles up/down before returning to normal. Just how fast is normal nowadays, I don't know.

As long as it's not bouncing like "Uncle Buck's" car your good. LOL

yah or u see any physical leaks.