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GTX 20w-50 is good for the summer, but I use 5 - 50 year round because I use my spider well into December (in NJ) I also recently changed the gearbox from spirax to a 75-90 syntetic for the same reason, easier to shift in the winter.
On a previous spider I ised castrol 10-40 year round from 1986 to 1993, I do not recomment 10-40 because I had to have the engine rebuilt at 80K miles.
this is my personal experience, I used to alternate 20-50 in summer and 5-50 in winter but I don't see the point in doing this anymore. I drive the car 6k miler per year and usually a single oil change in the summer with 5-50 is good for the whole year. I have been using Purolator filters.
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Tony G. in NJ
 87 Graduate - Calimero  '90 Toyota Tercel - Babbaluci
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