Wondered about this again as I try to whittle down my stash, which right now includes mostly non-high mileage oil. My three vehicles have 140k, 131k and 170k, ranging in age from 12 to 23 years old. None of them leak and I’d like to keep it that way.
I use a combo of HM and non-HM oil in each and do 6 month oil changes in each. Typically, I try do HM every other oil change.
Once an older engine has been fed HM oil and the seals are presumably healthy, what’s the maximum amount of time you’d recommend going away from HM oil? The whole goal is to keep everything supple and not give anything a chance to start leaking.
I use a combo of HM and non-HM oil in each and do 6 month oil changes in each. Typically, I try do HM every other oil change.
Once an older engine has been fed HM oil and the seals are presumably healthy, what’s the maximum amount of time you’d recommend going away from HM oil? The whole goal is to keep everything supple and not give anything a chance to start leaking.