Lenovo ThinkPad X300 Hardware Maintenance Manual page 108

Table 30. Application of the thermal grease
When installing: Before you attach the fan assembly to the computer, apply
thermal grease, at an amount of 0.2 grams, on the part marked a as in the
following figure. Either too much or too less application of grease can cause a
thermal problem due to imperfect contact with a component.
a
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ThinkPad X300 Hardware Maintenance Manual