I just found http://www.drainitright.com/
It's supposed to be an OCI calculator from Lubrizol.
It doesn't seem to do the GM OLM'ed car's ("Please consult your owner's manual"), but for the ones that has a published maintenance interval, it seems to take that interval and apply a multiplier to it, if you drive weird conditions.
I think it's kinda interesting, if a bit conservative on the really short OCI end, if you put it on "High" level of protection. On "Standard" it seems to reflect a decent 5k-ish OCI.
It's supposed to be an OCI calculator from Lubrizol.
It doesn't seem to do the GM OLM'ed car's ("Please consult your owner's manual"), but for the ones that has a published maintenance interval, it seems to take that interval and apply a multiplier to it, if you drive weird conditions.


I think it's kinda interesting, if a bit conservative on the really short OCI end, if you put it on "High" level of protection. On "Standard" it seems to reflect a decent 5k-ish OCI.