Old Mechanic said:
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I didn't think it was related to the change in oil viscosity alone. In fact I don't think the oil viscosity has anything to do with it , which is why I asked about the radiator. Radiator degradation is very common and the processis so gradual many people miss the symptoms and loose a good car to a $120 radiator.
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Agreed. The oil viscosity is unrelated to the problem.
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Originally Posted by Baltothewolf
Also, I live in the high desert. 90+ degree summer days but the nights I know where it ran cooler it was within 5 degrees the same.
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Then you don't need a low viscosity oil. 10W-40 should work fine.