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I used 20w 50 synthetic this summer and it worked very well. I do have a turbo car (1983 - non intercooled), which heats up the oil a lot, and it took the abuse well. A good winter weight is 10w 30, which is what I have in now. I wouldn't worry about what some people say about synthetic, beacuse it has worked well in my car, no extra leakiness or anything, at 193k miles. Its more expensive, but the drain interval is a bit longer. Check old posts, there have been a lot about oil.
My opinion.....
Really cold = 5w 30
Normal winter = 10w 30 or 10w 40
Summer = 10w 40 or 20w 50
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