Check out the latest Behind the Bastards podcast about this. Mostly a scam to raise funding and also a good bit of creepy eugenics tossed in too!
Cad
A dull man with an old car would check his engine oil level regularly and add small amounts of oil as needed. I check mine each time I get gas.
You are destroying your engine through negligence. Not dull at all!
But for real that warning light is a low pressure light. Not a low level light. If it comes on either your oil pump has failed or your oil level is so low there is nothing for the pump to pump! If the engine now makes noise when the oil is low it's on it's last legs.
Be dull and start saving for a different car.
Generally if your chain breaks it was super worn out. The cassette is probably toast too. The quick link is now the only "new" component of the drive train and won't work smoothly with the old stuff.
Replace the worn out stuff. Take a look at the chainrings just in case. They usually last through several chains and cassettes but wear out eventually.
I can't find an off the shelf tool for that. Pedro's universal crank puller has an 8mm built in and the handle is removable leaving a larger hex for a wrench. Not sure if that is a 15mm hex head though.
The Park Tool CCW-5 might work too. The 8mm allen/14mm socket part can be somewhat easily knocked out of the handle and carried alone. I can't remember what size the remaining big hex is.
Run over to your LBS and measure up either of those.
Never heard this stuff before! Punk sensibilities mixed with spoken word and rap with powerful lyrics. Good shit!