Can a heatsink leak oily substance?

[Okkx]

Hello,

I bought a used and broken Macbook Pro mid 2015 i7 2.5ghz with broken keyboard, speakers and trackpad. I replaced everything and it works perfectly except than the temps are quite high even with the heatsink and fans perfectly cleaned, and new thermal paste.
When I first opened the case, I noticed a oily substance everywhere on the motherbord, and around the right fan. I thought the previous owner spilled oil on the machine. Cleaned everything with 99.99 rubbing alcohol.

But I found on another forum that the oily substance on the motherboard is actually a leaking heatsink spilling its coolant, which makes me a bit doubtful. (but that would explain the high temps (85°c while browsing / watching videos on Youtube).

Is there any evidence showing that Apple is filling their heatsink with oil? I can't find anything about it, and nobody has ever cut one to show the inside.

I am ready to buy a new heatsink but don't really want to waste money if the oily substance is not actually coming from a "leaking heatsink".

Thanks for your help

 

[Sheepish-Lord]

Only computer part that would require "coolant" is if it's a liquid cooled component and uses some type of radiator/pump configuration. Having a stagnate pool of "coolant" does nothing to cool a component so the fluid needs to be constantly circulating over the radiatior/heatsink just like it does with a car.

That said odds are extremely good that Apple uses a traditional heatsink which is nothing more than the material it's made out of and the design as it's simply a way to transfer heat away from the chip and the fans disperse it.