New cars may consume some oil initially. Switching to 5W-30 makes sense if you were to see continue oil consumption. Any oil consumption would be related to the operating temperature viscosity (the second number). Switching to 0W-30 would make more sense unless you wanted to use Mobil1 EP, since it is not available in 0W-30 but is available in 5W-30.
Quote:
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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