The lower temp tstat is more to help control summertime overheating episodes. Theory is the lower temp tstat opens earlier during temp rise to help the (borderline sufficient capacity) radiator get a running start to keep rising temps from running away beyond control.
Roundabout you could call it a head gasket saver. More of an aluminum head saver.
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1985 744 gle d24t
1985 745 gle d24t
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