Grease is grease. Some is better than others. The stuff they foist on consumers as being "thermal paste" specifically for computers, is just plain old white lithium grease, available at your local auto parts store for a FRACTION of what you pay for "thermal paste".
I don't know about others, but I have no need for axel grease so do not have any.
I have a small tube of "thermal paste" which has lasted years.
It is easy to handle, store and use.
I know it is sold for a purpose and thus am aware that it will not be harmful.
If I purchase a can of grease from my local hardware store the salesperson will not be able to advise me about the best product for the intended purpose.
Neither do I know the proerties of the CPU surface that comes in contact with the heatsink, so have no idea what 'could' be damaging to that surface. Last CPU I recall seeing did not appear to have a metal surface .... but I could be mistaken I guess.
So, all in all, I find it more convenient to use what is known to work and sold for the purpose.
Just a thought ....... if the grease you write about is so good at the same job, and so much cheaper, why do commercial entities not sell that grease in tubes as thermal grease for use on CPUs?
Is it maybe because it is not as thermally efficient at the temperatures that CPUs normally work at?
Good questions! The only part I don't understand, is why anybody wouldn't have use fer a can o' grease! (Checked yer wheel bearings lately, they can and do run out of grease occasionally, the obvious symptom being that yer wheel flies off the car as yer rollin' down the road).
My friend, the grease they sell you in those little tubes, IS a type of the same grease i'm speaking of, the cheapest most basic stuff they can buy with pretty much none of the addtitional processing and materials that make up a better quality grease, that's why that stuff hardens up after a couple of years.
Once it hardens up, it is no longer a conductor of heat, it becomes a dielectric, what you also might call an INSULATOR. That's right, once it hardens up, it's actually HARMFUL, insulating your heatsink from your processor to a small degree, making it run hotter, which wears it out faster (so they can sell you another one sooner, planned obsolescence, keeps the manufacturers and the techs ringing that cash register $$$ as you buy into their BS and wear out your own stuff right about the time the warranty runs out).
Good quality synthetic auto grease, takes literally decades before it will harden, the stuff I use works from
-40 degrees f, to over 300 degrees f ( 150 celsius). Automotive greases all come with a product data sheet, and an MSDS (material safety data sheet) by U.S. law that you can request from the manufacturer or look up online. So if you have a question about how the product is formulated, it's all right there.
Every CPU i've ever used, has had a sturdy metal back, they have to pretty much, to withstand the high temperatures, and begin the process of heat transfer. And as i've stated, the grease is just a teeny tiny fractional layer, that more effectively couples the CPU to the heatsink.
Think about it, wheel bearing grease is meant to work at high high temps, with constantly rotating metal parts of varying composition, and is designed to protect those parts from degradation due to heat and wear and tear from a huge amount of friction, it also couples the innermost rotating parts to the outside of the axle shell which is how an axle bleeds off the tremendous heat generated from the rotating mass.
It's not a big deal, i'm just saying if ya got some laying around, ya might try it.