Hello, I'm Danny.
Yes, definitely pre-oil before install. If you are in a hurry to install submerge them in a container full of oil and using a push rod manually depress the cup up and down to prime the lifter. If not in a hurry you can just leave them submerged in the canister full of oil for a few days and the air will escape and the lifter will fill with oil. Hope this helps and feel free to ask any questions if needed. Thanks for using 2CarPros.
Danny-
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Wednesday, February 6th, 2019 AT 9:33 PM