I was using an oil based coolant and found it to be very sticky and it also created a lot of fumes. I have switched to Ultracut evo 250, mixed with water this stuff does a really good job without having to use loads of it. Aluminium can be sticky when it warms up and will clog up sharp tooling easily. The chips wont take all the heat away but should take away a good portion of it if your feed rate/spindle speed and DOC matched up.
You could try this: single flute 6mm cutter at around 700mm/min 12000rpm and 1.2mm DOC should give a good finish with a little coolant sprayed on and extraction to remove the chips from the cut.