Originally Posted by LakevilleSSEi
My LIM gaskets were trashed, but I dunno how old they were or anything like that. As far as I'm concerned they had 209K on them, because that'* the mileage when I changed them out.
That might be, but as with any recognized maintenance item, the intent is to change things before they become a problem and potentially cause issues elsewhere. Thus the term "preventive maintenance". Mine had 125K + on them when they went, but I think I'll change them again at around 200K.
IMO, the new aluminum based gasket set from GM may be a permanent fix, but only time will tell.