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What is the proper weight of oil in the SU dashpots? Every thing I've ever seen says 20 wt. Yesterday I went to my shop to adjust the choke . With the filters off, I tried to raise the piston. Being 25F in January, it acted frozen going up or down. I really could not raise it with just one finger. Would 5W20 work in cold weather, or ATF? 50 years ago, in Iowa, my '59 was my only car, and it barely ran in cold weather. No wonder! Le