New to me 2000 Lexus ES300

[d_rock]

Hey guys,

I bought this Platinum edition ES300 recently and I want to start giving it some TLC. I aim to get 300k miles on this baby. Currently at 92k miles. Some pics here HERE
Seller told me this car had one owner who would regularly take the vehicle to the dealership for maintenance. When I pulled the cabin air filter it was filthy making me think otherwise.
The vehicle turns on without any issues and shifts smooth with the A/C on blast. I haven't had time to register the vehicle yet to test more of its components but from my visual inspection and thoughts I have developed this list of things to do. (Not in any order)
Seller told me they put in a new battery and new brakes (which I will inspect).

• Timing belt and water pump (I will out source the labor)
• Oil change
• Transmission flush
• Engine and cabin air filters
• New spark plugs
• Replace all cracked power steering hoses
• CV axles
• New tires.
• Maybe valve cover gaskets (No leaks visible)
• Add a fuel additive (Seafoam?)

I also noticed the coolant reservoir is below the low level. I plan to keep an eye on the temp gauge and add coolant to the radiator and after it hits running temperature check the level again and inspect for any leaks.
No check engine lights on but I want to buy a OB2 scanner just to be sure.

Are there any other repairs/maintenance that I should add to the list?
What do you think about using Seafoam?
Thanks

[RX400h]

Did the vehicle come with the maintenance manual? If not, you should be able to do a search for one. Certainly some of the requirements require action due to length of time vs. mileage.