Toyota Motor Corporation includes Scion, Lexus & Hino brand also. In 2010 Toyota ranked # 1 in the world on the basis of units produced. In USA Toyota vehicles is considered as the best quality vehicle.
Toyota is a strong automaker and despite all the hardships it faced due to Tsunami in Japan, sales in USA in Sept 2012 were 40-42% higher, thanks to New Toyota Prius, Toyota Camrys & Toyota Corollas. Most importantly Prius sales have doubled. All segements of Toyota, be it vehicles or parts have increased in 2012.
Most Toyota engines are made in Japan but first Toyota V8 motor was made in Alibama plant in 2003. This plant now manufactures 4 cylinder engines but all production is on the basis of same TPS production module which Toyota has been following since 1937.
In short Toyota engines go through strict quality control before they go in their vehicles. Toyota at this moment is the only manufacturer with most models of sedans, vans, pickups. They launch minimum 5 new models every Year.
There are very few sources you can buy low mileage Used Toyota Engines in United States. Some low mileage Engines that come from Japan are available but they are very limited in quantity. We recommend http://www.alltoyotaengines.com for all your Toyota Engines or Toyota Transmission needs.
We also recommend http://www.usedjapanmotors.com/
Japanese transportation laws are conducive towards availability of low mileage used Toyota engines out of discontinued crashed cars. Main reason is that these laws restrict people from driving more than 5 years in Japan and most Japanese people drive only on weekend because parking is so expensive in Japan and it is worth while to take bullet trains or subways to work as Japan has a very well-connected public transportation.