What is Oil in betting?
                  Rather than just backing the 
favorites, many 
bettors try to find a game where they believe the 
sportsbook has made a mistake when quoting the 
odds and 
wager accordingly. This can be sometimes referred to as ‘good oil’ or ‘
gravy’. Sometimes your friends will gloat they have extremely good Oil. It is usually unlikely that your friends, do indeed have good Oil.