There may be some situation when you really need to replace an engine in your vehicle that used engines would work just fine. The one important point to select from used engines is to know what you are actually looking for. There are huge chunk of vehicles laying in junkyards and garages that have just perfectly working engines selecting and buying one can save your hard earned money as compare to buy a brand new engine from the manufacturer or dealer.
The very first step towards buying used engines is sort out what engine will fulfill your criterion. Although engines are specific to cars for the most part there are also some crossovers in many models. Putting a little effort in research first to determine what cars and what years would have an engine that would suit your purpose.
When you have evaluation phase done that what engines are to meet your needs then it comes how to find it online or by visiting dealers one by one, obviously finding online would be one that you will resort to. In doing so look for one who is offering you low mileage engine and gives you some kind or warranty too. Firstly look for the miles on the engine if it is still in a car you may be able to see this on the dash if its out of the car a lot of the time the wrecker will know the mileage. Mileage is only one of a few indications of engine condition. Secondly to test the engines cylinder pressure holding capability this tests the integrity of seal between the head and the block and the seal of the piston rings. One can do this with a 'Leak Down' test. The purpose of this test is to evaluate that does engine require rings replacement or not.
While buying used engines, oil reflects best the condition of inside in engines. If the oil is like milky one that shows there is leakage in the oil and water systems. And if the oil is low that shows there is constant oil consummation and is sign of aging or defective rings. But if the oil looks Golden Brown and a proper level then this is used engine that you are looking for. The nutshell is that if you successfully able to find out good working, high performance and low mileage Used Engines for your dead vehicles than you are lucky one and just saved your money up to 70% as compared to buy new ones.