Nano oil is expensive mineral oil. Not worth the price increase over anything else. Other oils last longer and provide better corrosion resistance. Most of their advertising on there website is Alot of snake oil.
Grease vs oil is a preference. But also grease has a purpose. Grease is a solid sorta. It goes on and a carrier fluid evaporates and dries. It forms a Teflon washer. Teflon is slick. Also doesn't attract dust and if dust is around it can't really work its way in. And if it does, usually wont affect the function. It's pretty good at staying put when washing the knife too. Applying too much can be an issue.
Good idea to use Teflon generally for washers but it's not uncommon to see it used in bearings tho the action can vary depending on variables. Lightly oil the detent track instead of using grease as it's too thick for that operation.
Oil on the other hand gets applied wayyyy to much by the human brain. We think that since we pour several bottles of oil in a car that, that's how it should work in a knife, but that would be wrong. More oil just attracts dust and can slow down action. If you apply a decent oil and just wipe it off, it will still be their until you clean it off with a solvant. This minimal amount will attract less dust and make sure friction is lower.
Both should be good to provide corrosion protection.
As for the gimmick of the Nano oil weight... If you apply it like I suggest usually this weight is bs. Apply oil in the necessary areas and wipe excess so it doesn't even look like it's there (angle it in the light or see your finger print in it, that's good enough). Then weight does not really matter. It's a ruse really. Something used for cars, not pivots.
I love nick Shabazz but he loves his Nano oil. He's tried a bunch of stuff and says Nano Is the best (at least for him). I don't agree. I've got Nano oil and a bunch of other oils and greases. You'll notice he applies too much. And recently started applying less than prior.
