Quote:
Originally Posted by Transport3r
If you really want to find out, do a UOA with 0W30 and another one with 0W20. I did and the 0W30 had significantly less aluminum and iron wear. I’m in a hot climate so YMMV.
Edit: 0W30 instead of 5W30 allows you to have the same cold start protection as 0W20.
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Just to add to this, to be more clear, 0w-30 and 0w-20 do not have the same cold start protection. 0w-30 may have a higher viscosity index (but not always, you can search up various oils and their viscosity indexes to get an idea), but it will still have a higher viscosity at most of the temperatures we witness.
EDIT: quick example - see link below on last page. Notice that even a 5w-20 still has better cold start protection than a 0w-30. The number on the right tends to hold fairly true for how oil behaves at hot temperatures, but the number on the left is more of a general guide for what the oil is trying to shoot for so to speak. Further apart, such as 0w-40, means the oil will typically have a better index, which is a good thing.
https://amsoilcontent.com/ams/lit/da...tins/g2880.pdf