Just a comment about Formula Shell conventional and cold starting. I run FS in several service cars here in Western Massachusetts and it's been below zero for about a week now and I find no starting issues running there 5w30 and 5w20 oils. It seems to start just fine even at -10F in several car makes. I usually get it on sale at HD in 5 quart cantainers and I have run several cars on this oil for several hundred thousand miles without issue.
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