1)no no! do NOT EVER put any sort of oil in the marker! use dow 33 or another paintball lubricant. Oil will find its way intot eh solenoid and break it.
2)Upgrades are hard to find nowdays because as far as I know, they're not made anymore. icd-owners.com has them pop up occasionally in the b/s/t section though. It's a good investment.
3)You can always buy a promaster ram and noid and turn it into a sleeper promaster
here's a big list of things about it.
ATTENTION: The Ultimate BKO FAQ - PbNation