Even in the event that you don’t even trust the parts vendor (which typically is justified), it's an impossible task to ensure the secondhand dealers are better than the manufacturer for those components they market into. The seller simply cannot be expected to give the auto exactly the identical treatment it obtained when it was brand new, while the trader is much more inclined to offer OEM radio auto parts to you for instance, with an expectation that all is new and in functioning order. It is not fundamentally the job of the automobile vendor to learn every detail about auto elements as well as their own functions. Likewise, if the trader buys autos in a major discount and sells off them , he isn’t even fitting the prices on accessories car-parts he would have gotten if he acquired cars directly by producer. There really are a whole lot of facets - manufacturing, and inventory management, along with a lot of others - that make clear why each car may be marketed for an alternate selling price, but undoubtedly these sorts of problems have consequences for benefit margins, and also finally , they help establish the caliber of the components. .