I have had several cars that specified 0W-20 and they didn't burn any oil. Any speculation on the impact on engine life is just that: speculation. If you can't run a controlled experiment and actually prove the hypothesis then you are simply guessing. Do what you want but I prefer to follow the manufacturer's recommendation as they know more than me.
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Originally Posted by Wiotte
Now I have a 2017 Mazda, requires 0W-20. Has burned a quarter qt. in 5K miles. Will switch to 5W-30 for its first oil change. Guaranteed I’ll burn zero oil between changes.
This whole 0W-20 nonsense is meant to increase the fleet mpg, but it will decrease the life of the engine. But since most of us won’t drive 400,000 miles on one engine, it’s moot. I just hate watching the oil level decrease substantially between oil changes. It’s goes against my grain to open a qt. of synthetic just to top off the level.
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