People can trust original product manufacturers' manuals that appear online, as they provide the most accurate source of repair information. Large manual directories, such as ManualsLib.com and ManualsOnline.com, offer the most trustworthy online source for many manuals. In addition, many manufacturers offer product manuals online.
The law requires automobile manufacturers to publish their repair manuals online. JustGiveMeTheDamnManual.com offers a simple manual directory for 25 major auto brands. ManualsLib.com features nearly 2 million manuals for 1.4 million products, while ManualsOnline.com features over 700,000 product manuals.
Companies often refuse to publish repair manuals in an attempt to protect lucrative in-house repair businesses. As a result many repair manuals are only available from third-party sources.