1... loctite is used to prevent screws,bolts and nuts from coming lose from vibration.
2... use whatever oil makes you feel good. Any oil will be fine as long as you change it per required with a new filter and is the right weight for the conditions you ride in.
3...Purolator filters are better constructed the fram. there are others that will work just fine.
4... Any slim kit will work, pick one that is the right size for the bikes tires and that is easy to store on the bike.
Some people are very fussy about what they put in and on there bikes, just do what feel right for you. If you follow good preventative maintance your bike will last damn near forever.