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5w20 was the original spec, and most 5w20 has much better shear thinning resistance than 5w30, but that is also a number crunchers thing (5w30 will thin more than the 5w20 but will still be closer is weight to 20 that the 20 would be), but maybe a heavier weight oil might slow it down enough to make it worth it.

At some point, enough wear in various places causes oil consumption, and it becomes a game of keeping it from running out, and all the other issues burning oil causes. I ran 5w20 in my Grand Marquis (it was originally specced for 5w30 but back specced for 5w20) until around 260,000 miles. Then it would use a quart in 4,000 miles (I topped it off at oil change to the top of the full line, 1 pint more than the 5 quarts it held) and I would add another pint to get to 5000 miles. It wasn't that big of a deal, but it did mean keeping tabs on the oil more frequently than I had gotten used to. But my older carbed vehicles I had to consistently check the oil, add, and change it much more frequently. It used mainly because of worn valve guides/seals (it would puff at startup if it sat for a few days, or at a WOT take off from a long red light).

Oil color is not a great indicator of much unless it is pink, white, or chocolate colored. Higher mileage, more worn vehicles will turn it black very quickly, but that is oil doing what it should, keeping it in suspension.
 
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