Detergent in the early oils would lossen up the sludge and cause issue such as clogged hydraulic lifters, etc. That was because the early oil were all non detergent and many a time I pulled a ford or chrysler (they did not cool the heads as well as the chevy's, but the chevys as well) valve cover off and the sludge was formed like jellow out of a mold to the valve covers with just room where the rockers traveled. Oil has come a LLLOOOOONNNGGGG way.
G-Oil Guy seems to know his stuff for sure. Need more informed techs on here to share their knowledge. Lot's of mis-information on here and most forums on so many subjects.
We do oil analysis on some vehicles and on our race tow rigs in the past and that tells you a detailed story as to whats happening. I would ONLY run full syn in a car you expect to keep for some time. I tear some of these LS motors apart with 150-200k plus miles and they still appear like new inside if full syn has been used.
