I just finished the silver foil packet of thermal grease that came with the X1C. I’m glad to hear recommendations for suitable replacements I can buy on Amazon.
Thanks!
I do a lot of system building and have tested a number of thermal grease, pads and thermal tapes. What if I told you that it is all hype? So long as you have something that is thermally conductive, any thermal grease will do, do not let anyone persuade you otherwise.
The best grease is the least expensive. Here’s a search term. If you paid more than $8 or 8EU, you got ripped off.
There’s a ton of entertaining YouTube videos on the topic of using everything from Peanut butter to toothpaste to chocolate as a thermally conductive barrier between overclocked CPUs and their respective heat sinks. If you look at some of the results, there’s less than a 3-5c difference in thermal conductivity which for 3D printing is close enough. https://www.youtube.com/results?search_query=PEANUT+BUTTER+as+THERMAL+PASTE
NOTE: I’m not suggesting using peanut butter. 
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I’ve been using this. Rated for higher temps than most:
GENNEL G104 100g Tube White Thermal Grease
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I have no experience with thermal grease of any type. I am looking for some to have on hand, and after a year and a half I probably should be refreshing the grease on my nozzle.
There are lots of options, but when I look at specs I see many only claim a working range up to 150 or 200 °C. I don’t think those would be good choices since all my nozzle temps are always at least 220°C and often up to 280°C.
That’s assuming I can even find specs. Arctic does not provide a thermal conductivity spec because other companies lie. “ARCTIC made a conscious decision not to specify any values for the thermal conductivity of its thermal paste and thermal pads, because many manufacturers invent, artificially inflate or embellish this value. Thermal paste has a thermal conductivity of 1 to 4 W/mK. Values outside of this range, such as 12.5 W/mK, are at odds with the truth.” So, you can’t test and tell the truth about your product because others tell outrageous lies? What are you, a politician?
At the moment, the boron nitride from Slice Engineering is most likely to be my choice, but I’m still shopping.
Well… if you’re looking for a recommendation, I used GD900 “only” because it was the cheapest on the market at the time. I paid $12 for a 30g tube which was way overkill for my needs. Then some shmuck on YouTube did a test of all thermal grease and this outperformed others and afterwards, it shot up to $30 per 30g tube. Note that his test only showed a 2-3C difference between that and Thermal Grizzly metallic at nearly 50X the cost.
Why mention this, because it’s same grease used by other thermistor suppliers.
Again, the point is, buy the cheapest “Shite” you can find and it will work just fine.
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I have spent a lot of time checking out thermal pastes that would be suitable for 3D printer heating elements. While the ideal paste is xxx, I ended up going with Gennel G104 thermal paste. It’s rated up to 300°C, well above the 200°C rating of GD900. Thermal Grizzly Kryonaut is rated for 350°C, but the price is higher…
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Yeah I agree, I just use the same paste I have for my pc, works a treat and never had a problem.