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It depends on how worn your bearings are. My 86 has 225k miles, if I use 10w30 it reads fine cold, but zero oil pressure at idle when hot (not good). 10w40 is not much better. Using 20w50, at hot idle it reads about 1/4 of the way up. If I knew where to buy 10w60, I'd consider it. But that's on my high-mileage car, yours may do fine on 0w20.
Thinner oil means less friction, but you want your oil pressure needle up far enough you can tell it's not at zero, at all times. I'd start with a cheap oil in the middle of the range (10w30 or 40) and see where the oil pressure is. Then change viscosity up or down according to the actual oil pressure on your car.
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