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More Confusion about Proper Viscosity 200 1985

I agree with Jim. My daughter's 83 (145k mi) was showing a tendency to overheat when pulling hard on a warm day, despite semi-annual coolant flushes throughout the 20 yrs we've owned it. I pulled the rad (easy on a 240) and a rad shop tested and said it was almost 50% plugged with scale. After rodding out and reassembly ($85) everything's cool again.
I can't see how your choice of oil viscosity would contribute to overheating.
--
Bob (81-244GL B21F, 83-244DL B23F, 94-944 B230FD plus grocery-getter Dodge minivan, MGB, and numerous old motorcycles)






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