I'm guessing the '90 has a few miles on it. Personally, I prefer 10-40 in the summer as I feel it offers better protection when the temps are high. As far as your Chrysler, depends on bearing clearances; loose, the 20-50 if fine; tighter, as the factory built it, I would again use 10-40. I'm guessing you are running a 180 or so thermostat in this car. If it runs hot, 200F, you may want to consider the 20-50.
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