Originally Posted By: gregk24
Timing chains wear just like everything else, they also stretch...
No they don't (stretch)
Originally Posted By: gregk24
, regarding timing chains, will oil pressure oil thickness, or even add pack (oil with high anti wear additives) contribute to longer chain life.
oil pressure: No, don't think so, since I THINK most timing chains run partly immersed in the sump and so are splash/oil bath lubricated.
oil thickness: Yes, probably.
anti wear additives : Yes, probably, since there is probably some metal to metal contact going on. How much might depend, among other variables, on the oil thickness and the efficiency of the splash/oil bath lubrication, which might keep the pins and rollers in hydrodynamic lubrication a lot of the time.
But anyway, isn't this a rather abstract question? The oil has to do rather more than just lubricate the timing chain, so wouldn't/shouldn't be optimised just for that.
Your question might make more sense in the context of an enclosed motorcycle drive chain, some of which I believe used to run in an oil bath, though I don't know which ones.
Most modern motorcycles have exposed chains, due to "the unfortunate dictates of fashion".