Installing cam this weekend. You guys use oil or assembly lube on roller cam lobes and journals?

The same oil I run in the motor I do prime my motors when spinning it on the starter with the spark plugs out before starting them also, oil the heck out of the valve springs also when assembling the motor
I also make sure that all my roller cam motors oil the rocker shafts full time either with Indy heads or by putting a full circumference oiling groove around the number 4 cam journal the width of the oil hole in the cam and around .030 deep IHTHs

Just motor oil.

I suggest soaking the roller lifters in a bath of oil for a few hours before putting them in the motor. Motor oil on the cam journals/bearings. I like assembly OIL (red sticky stuff) on the lobes, but motor oil is fine if the engine is fired in a few days. Like CAB said, if you prime the engine long enough before fire-up, plenty of oil will flow down from the heads to the lifters.

Set them in a tub of oil and let them soak.

Yes, lifters and chain have been soaking in motor kote 100 oil additive for a month now. Engine will not be run for a while maybe a month or two.

If use STP in a pump can for assembly and cam lube. Lifters i soak in mineral spirits....then dry and soak in motor oil for a few days before install.

School me on why the soaking in mineral spirits please.

As per the instructions they want you to thoroughly clean and flush them

yes, mine were soaked in mineral spirits and blown out to clean and inspect bearings. now soaking in oil additive.

Rollers are held with heavy grease when lifters are assembled. At least that's how it used to be. Soaking gets everything out. The rollers need to roll, oil lets them roll.

I soak mine in oil like the others suggest but my lobes get smeared with grease to help the lobes remain lubed prior to initial start up. I found some cam lube oil drips off prior to starting & by the time you set valve lash n set the timing there's not a lot of lube left. At least with the grease it doesn't fly off until the engine is up to running speed so the intial start has my lobes well covered.