Manual: In a manual transmission, the problem is not so much the fluid degradation, but rather fluid contamination. This contamination occurs over time as the synchronizers, bearings and gears in the transmission wear out. The resulting metal particles then float around in the lubricant.
A lot of mental illnesses can have a genetic component, yes (eg. depression, bipolar disorder, anxiety, antisocial personality disorder, etc.).
As with other mental illnesses, there may be many causes, such as: 1  Genetics. Certain people may have genes that increase their risk of developing eating disorders. 2  Psychological and emotional health. People with eating disorders may have psychological and emotional problems that contribute to the disorder. 3  Society.