i have finally applied the superlube OIL on all of my 10(?) flashlights and i've come to the conclusion: this is the exact kind of lube that i was looking for, it works perfectly well and it gets the kreisler's shilly two thumbs recommendation:
kreisler's Overall Rating: ★★★★★
it works really well on:
+ o-rings (silicone, rubber, i dont know, i mean who cares, wtf)
+ anodized aluminum threads (e.g. Tank E09, Lumintop Worm)
+ non-anodized, bare §$%&! aluminum threads (e.g. Quark X AA)
+ twist zoomies (e.g. Romisen RC-29, Romisen RC-29a)
+ stainless steel threads (e.g. Lumintop Worm SS)
it does not exhibit stellar performance on:
+ Titanium threads (e.g. iTP A3 Titanium)
In all above cases, the stuff works much much much better than the Nextorch Silicone Grease C*ap. What else can i 
? Since it's liquid, it easily flows into all grooves and slots with little external movement (e.g. twisting action). For example there is no need to lift or remove the o-rings; the oil would get there anyway. And now i am seriously wondering en quoi the superlube GREASE is superior for our application on flashlights. Maybe the grease is superior maybe it isnt, i dont know. I only have the OIL, and it does a fantastic lubing job: it effectively reduces the friction (drag/resistance) on the o-rings, makes the o-rings wet and "juicy", and also reduces friction in the threads, for two reasons: because it is non-sticky oil/liquid and because it contains teflon particles.
As mentioned earlier, the superlube oil is typically applied in fine rotating machinery, such as watches, clocks, and photo cameras. And since grease isnt commonly regarded as "liquid", i would assume that greased machinery parts produce more friction than fine oiled ones.
The only fear with OIL is/was: Isnt it too liquid, too messy and doesnt it run away?
My answer is: Yes, it is liquid (and viscous like liquid glue) but it doesnt run away. And no, it's not messy at all. ( *real oil* like the edible oils from your kitchen, *those* are messy stuff. surprisingly the superlube "oil" has not very much in common with what you would expect from a substance called "oil". not messy, not sticky. and easily cleaned/wiped away with kleenex )
I am not going to look any further. I know that there are even better flashlight lubes than superlube grease and superlube oil.. but i am satisfied already: reduced friction in the threads and on the o-rings!
Merely the performance on Ti-Ti threads (and SS-SS threads?) is questionable. My iTP A3 Titanium squeaks as if the threads were bone-dry: While it's better than bone-dry or the horrible Nextorch silicone grease, i am sure that there exists much better performing lube on Ti-Ti threads. Just a matter of price. As always. Because the more pricey option would be Nano-Oil, for US$ 16.00 shipped:
Also note that ChibiM has a relevant thread too: