Before now I have been running my computer with no thermal grease whatsoever. Its a p3 750 and only outputs 25watts of heat so it will run fine without it. However now ive started to overclock my temps have gone upto 44c (not that high but could be lower). So I thought well why dont I try normal axle grease. I put it on in the normal way and lo behold, 30c idle and about 35c max (compared to about 55c). Im pretty happy with this and until it gets any higher I dont really need to buy any proper stuff 
My sig's faster than yours, and it overclocks better too....

My sig's faster than yours, and it overclocks better too....