How do i know if the oil cooler is on tight enough?

 

You delete it and you won't have to worry about it.JMHO

 

Does it serve a big purpose? Mine is leaking where the weld is at on the end, i just took it off last night to take it to a local welder to have the leak fixed and welded up. If it dont make a difference, ill just shoot a line from the water pump to the radiator, block the holes up at the oil filter and call it done.