Oil Tycoon 2

Easy money:
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At the start of the game, make sure that the game speed is not running too
fast. Go into the stock market and buy £4 million worth of shares in any of
the refineries. Once you have purchased the shares the price should immediately
rise. Sell the shares as soon as this happens and buy more shares in another 
refinery. Then, do the same thing again. Once you have plenty of money, buy all
of the shares you can before May or June in the first year. Then, every three 
months you should obtain enough money from the dividends to either build up a 
mass amount before building your company or extra cash as you are building your
firm.

Sometimes the amount of shares available for the refineries can be very high. 
If this happens (mainly when you load a saved game) buy as many shares as you 
can afford. The share price can then go up by thousands. Sell them immediately 
and keep doing the same thing until your bank balance is satisfied.