Going overboard?

Hey all, I am doing some maintenance on my Gen 3 Prius IV, with 162K miles on it. The engine bay is super dirty, mostly because of a valve cover gasket leak that I am fixing. Here's a list of what I'm doing:

1. New Plugs/Coils
2. Valve Cover Gasket
3. EGR valve cleaning, Throttle Body cleaning, Intake Manifold and Intake cleaning
4. EGR cooler/tube cleaning
5. PCV replacement
6. Oil Catch Can Install
7. Fuel injector cleaning - I bought a tool on Amazon to clean them after you remove them.
8. Struts? - I'm not sure if I need to do this or not. This Prius IV is louder than my other Gen 3 Prius I as far as tire noise.
9. New weatherstripping/window seals
10. Sound absorption spray under wheel wells.
11. Sound absorption panels in doors.
12. Transmission fluid
13. Coolant and Inverter Coolant

None of this is due to poor performance, but I'd like to get the best MPG and have the car last as long as possible. I feel like I may have taken on too many improvements. I'm following some of the other posts in this thread but would appreciate your thougths. Thanks!
Ben

 

Thanks! And thanks for all your helpful YouTube Videos!

 

Would you consider replacing the struts to be preventative?

 

Yes I will do those too. I forgot to write them down.

 

Yes, I bought it with about 150 K. And it's pretty dirty.

 

Update: I started after church today and bought another set of valve cover grommets because the other ones were too hard to install so I ended up destroying them in the process. I got the valve cover reinstalled, power washed all of the removable parts from the engine, removed the fuel injectors and cleaned them with this Autool tool from Amazon.

It't not available any longer, but it basically hooks up to a battery to keep the injector open, and has a plastic nozzle that fits the end of the injector. Then you remove the spray nozzle from a can of brake cleaner, and shoot it through the injector to clean it out. They were pretty dirty so I'm glad I did it. But I was also covered in brake cleaner when I was done haha! The tool is just about worth the $12 I paid for it three years ago haha! I got the fuel rail and injectors put back on after cleaning.

I'm getting ready to work on putting the EGR cooler, valve and intake manifold back on, then maybe finish the catch can today. Still not sure if I'm going to replace the struts. I don't think they are leaking, just have torn boots, and 165K miles on them. I also replaced the PCV valve.

 

No, just Advance, Amazon, and Autozone. If I did the water pump or actually replaced the EGR valve, I might consider that. I didn't want to go through the process of reprogramming the computer so I opted just to clean my EGR valve.

 

There is not much room for my oil catch can. I'm wondering if I should have bought a smaller one.

That's the one I got. I think I may just secure it with zipties to avoid drilling holes in the metal over there by the headlight on the drivers side.