Mobile CPUs (any any direct-die cooling for that matter) are more prone to pump-out, where the chip and heatsink expand at different rates with temperature changes, and the varying gap between the two creates a pumping action. It’s best to use a thicker paste to avoid it, or even better, a thermal pad. Not that it’s the best in the long run, but I have gotten away with the thinner MX-4 in my laptop for about a year.

If you have maybe $30 to spare, consider buying some PTM 7950 since it’s second only to liquid metal (very hard to get right), and should be good for many years. Be sure to get it from reputable sellers though since there are fakes for PTM 7950.