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.).
Largely contributing to rising mental health costs include long-term psychiatric care and nursing homes, adding up to more than 40 percent of mental health spending. The $201 billion we spend on mental illness does not include the $193 billion in earnings the National Alliance on Mental Illness (NAMI) predicts we lose each year due to serious mental illness. While the findings of this study may not surprise anyone living with a mental health condition, they highlight the need for improvement.