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Typically I change the oil in the spring so it is nice and thick for the summer and a bit thinner for the winter. Having just rebuilt the engine and done a couple oil changes since it is thick and pressure is high when cold and to spec when hot.
Last winter on a VERY cold day I popped the oil cooler likely because of too much pressure. That was pre rebuild and oil bypass mod but not something I want to repeat.
I will keep doing what I am doing and shift by pressure gage. I do think 20/50 oil is too thick as a winter oil but I am not changing it again.
Thanks,
Chris
73 911 E
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