Originally Posted By: spasm3
For those who use mos2, do you feel its better to use it early on, during break-in or later after its broken in? Or is it better only once there is wear on the engine say after 100k miles?
Technically it depends on the reason you're adding it to begin with.
You could add it towards the latter end of an OCI to give a boost to the additives that are close to depletion, as to possibly protect better during the last few thousand miles or so...
Or,
You could add it in the beginning.
Now, many would argue "why not just buy an oil with a higher moly amount from the beginning?" - to which I would say: What if you had already purchased some new oil for an oil change, one that has little to no moly, and then realized your engine was starting to tick as you neared the end of the previous OCI? Say, you bought Valvoline, and didn't want to go buy something else... Throw in some Mos2 at the oil change, and there you have it.
Sure, doing so could mess with the stock add-pack, and thus make some of the other additives less effective, but the added Mos2 means you're relying more on the Mos2's moly to quiet the tick. For just one OCI, it wouldn't be the end of the world. Once that OCI is over, when you buy new oil, just get one already formulated with more moly or more ZDDP, whatever you prefer to quiet your tick (if it isn't something mechanically wrong, maybe just something simple like piston slap, etc.)...
I've used Mos2 before right as I poured new oil in. For that exact reason above.
~ Triton