Use synthetic oil and you won't get sludge. Recomment Amsoil or Mobil 1 (5-30)
Change once, drive maybe 1000 miles or so, Then change again. Synthetic will CLEAN the sludge out for you!
Get a hold of a toyota dealer and buy their coolant, tranny fluid, filters, etc thru them to save $!
Also, toyota publishing has 800 # for a set of manuals - YOU WILL BE GLAD YOU HAVE THEM :D
I always Deal with the Local lexus parts store here in KC. They always match a price (internet) for the general maintenance parts I need.
Please put your model, year, mileage, any mod.... in your profile to help us answer your questions.
Enjoy Your Machine
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