Yeah, but I've had a bad experience with stock fans/pads... so I'm waffling on which to use.
I've always just used the stock gunk that comes on the heatsink. The only times I've used something different is when I've removed the heatsink to put a different one on or move the CPU to another board.
In those cases I've used some silicon based heatsink compound I got from Tandy approximately 25-30 years ago for electronics.....and it finally ran out a couple of months ago......Damn it! Anyway, never noticed any difference between it and the stock gunk.
Still, 25-30 years - not bad for a 15g tube
And now it's on to the silicon based compound I got with an electronic kit only 15 years ago