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.).
~ 1 min read. Five major mental illnesses â depression, bipolar disorder, ADHD, schizophrenia and autism â are traceable to the same inherited genetic variations, according to the largest genome-wide study of its kind. These variations account for 17-28 percent of mental illness risk.