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Just a wild guess, but 90% of the information I've seen by individuals about oil details are wrong, often fundamentally and conceptually wrong as well as misguided, wrong headed, and factually flawed.
OTOH I am willing to accept that at least 10% of my own knowledge is faulty, so I have no idea what is correct. I have learned that running without oil is bad, especially with hydraulic lifters, but not much beyond that.
My first car had a LOT of miles, and would knock when cold with anything less than 80 wt oil. It also had a weak generator that took 6 months to get from Italy, so when cold it would either start on the first rotation or not at all. Once the oil got up to about 185F it started to feel pretty frisky.
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