Suitable bicycle grease for aluminium and steel materials?
After thinking longer about feeling unwell. I research little bit longer about what is the suitable grease for seatpost, especially on aluminum material.

I found out on the internet talking about using a grease on the bicycle. In there, they said about do not using the grease on the seatpost because can cause damage on the bicycle. The reason is that grease can make the seatpost slip and must tighten the clamp more and more which can cause bad for the bicycle or cause the crack sound because over tighten on the clamp.

The advice they have given is used like "Assembly Paste", like this product "Anti Seize Assembly Lubricant", which specifically designed for use such as in the seatpost area. Because the cause of problems in seatpost is corrosion, erosion, abrasions, due to large friction which results in changes in size at seatpost, and then makes the other problems such as crack sound and slip. 

Then the result is "Assembly Paste" prevent all the causes, and I will go for it.

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Thanks to all who have participated. I hope this can be a useful reference.