Quote Originally Posted by Professor X
At Toyota we use Top Engine Cleaner which is a chemical that is fed into the intake manifold after the throttle body. We clean the throttle plate first and then run the engine cleaner. We remove a vaccum source and run the cleaner. Our cleaner requires that we raise the rpm to 2000 rpm as the cleaner is run through the engine. It results in a ton of white smoke but don't be alarmed. I'm sure that Toyota would not allow us to use a harmful product on engines. This service is standard every 30,000 miles on a max service.
its actually on services every 15k with toyota.

dont have an engine oil flush done, all it usually does is wash oil gel buildup to the oil pan and gets in the pickup, its not worth it. i highly recommend a top engine service which is what professor x was describing. im not sure if seafoam makes a similiar kit but you could always stop by any toyota/lexus/scion dealer and pickup the kit. i use it on my toyota and honda both, and have used it on many other vehicles as well.

it comes with a throttle cleaner, a fuel additive that you put into your gas tank to help clean fuel pump/lines/injectors, and also the top-end service that runs through a vacuum source while the engine is running and does a remarkable job of cleaning the intake manifold and carbon buildup off the pistons.