No, I don't think a rich mixture can be blamed for cool engine temps. The mixture contributes to cylinder heat temps, but does not contribute to oil temps much at all. Oil temps in Porsches and also, (believe it or not) engine temps generally, the main and rod bearings are making the heat. that's primarily where engine heat is generated not the cylinders. Lean mixtures can melt spark plugs and pistons and burn exhaust valves, but they won't boil the oil.
In the winter, when we have thick, very humid 25-40 degree morning air, my car also never gets a warm front, trombone cooler. The oil temp never gets to the first line on the gauge. Normal. Relax.
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'83 SC
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