How do I drain it? What fluid would you recommend?

 

There's 2 bolts. The one on the side facing towards the rear bumper, that's the fill plug. You'll need a 23mm hand wrench. I only use mostly metric tools. Unless you have a short enough socket to fit in there. The space is pretty tight, & you'll need to give it a pretty good torque to release. Never use a adjustable wrench or wise grip when torqueing a bolt.

The second bolt is on the bottom. It's the drain plug, you'll need a 24mm socket.

1. First release & unplug fill bolt.

2. Second, get your oil pan ready, release the drain plug.

3. Let it drain, while that's happening clean your bolts. It's recommended you replace the washers for both plugs. Go to your local Honda they have it for cheap or if you know someone there they'll just give it to you for free.

4. Put drain plug bolt back on, torque it pretty good. I just go by feel. But if you have a torque wrench that measures, around 30lbs is about right.

5. You'll need one of those pump fillers, it'll be about $7 at your local auto parts store. Connect pump hiose to side fill hole. Pump until you see fluid running back out.

6. Wipe dripping fluids clean, torque fill bolt back on as you did drain bolt.

7. You'll need 1 quart of fluid. I used AMSoil severe gear SAE 75w-110. It's real good stuff. I usually order it from hardtop guy unless you can get it somewhere else.

 

^That or this:

https://www.s2ki.com/s2000/topic/348...-fluid-change/

 

I'd recommend you remove the fill bolt first. That way if you find you can't get the bolt out you can drive the car to a shop and have it done.