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My experience with 10w40 Mobil One synthetic is that I get many miles of use out of my engines. 200k miles on my 2001 Silverado, 320k miles on my wife's 1999 Avalon (so far). I change the oil and filters at 4000 miles. I've tried 5w-20 in the truck and the lifters rattled a lot; so I changed that out after 1000 miles. Now, I live near Atlanta, so it doesn't get as cold here as some places. If I still lived in Michigan, you can bet that I would use a thinner oil. And if I had new cars I would use a thinner oil.
Years ago, I used to see advertised an electric auxiliary oil pump that was used to circulate the oil prior to starting the engine. If I lived in a cold climate, I would look for one of those.
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