Regarding the oil, I asked the mechanic (who did the valve seals and recommended me 20W50) the same question. He said that he would not expect this winter to get much colder than 30deg, and therefore such oil would be ok.
I will give it a try with synthetic oil. Synthetic oil of the same weight than dino has a lower cold cranking viscosity. I will see how good starting is and how fast oil pressure will build. I bought 6 quarts of 20W50 Schaeffer oil which is a synthetic blend. The tech specs suggest it might work also in cold climates.
Bruno

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1992 300TE 160 kmiles