Anti freeze and bearings don't get along well. They are to cheap to not change after being contaminated. If you have gotten away without replacing them you have been real darn lucky.
I don't believe that's the case anymore not that it's a good idea to run antifreeze in your oil.
I remember in the late 70's 8v92 Detroit Diesel engines had an issue with liner seals. They would fail rather suddenly and if the low coolant light came on and you didn't shut it down immediately, the crank went flat very shortly after. Glycol would destroy the bearings.
Sometime shortly after that they either changed the formulation of the antifreeze or the bearing material or maybe both as glycol contamination just doesn't seem to be an issue anymore at least in the short term.
I seem to recall 3.8 GM v6's with plastic intakes that leaked antifreeze and all they did was fix the leak and send it down the road.
Kevin
