good oil
Accurate details or information. Primarily heard in Australia. You should start seeing him as trustworthy because he's only given us good oil so far.
the good oil
Reliable, trustworthy, and pertinent information. Primarily heard in Australia, Canada. She seems to think you can get the good oil from what other people post on social media.
good oil
reliable information. Australian informal This expression has behind it the image of oil that is used to lubricate a machine and so ensure that it runs well.