Re: Oil weight
The October, 1928, Ford Dealer Service Bulletins say to use SAE 40 in the summer, SAE 20 in the winter.
Winter in South Florida probably does not require the SAE 20, not cold enough. And if you park your car in the garage for winter in Wisconsin, you can probably skip the SAE 20 oil then, too. It will be warm enough in the spring when you start to drive again to use the SAE 40 oil.
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Jim Cannon
Former MAFCA Technical Director 
"Have a Model A day!"
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