For what it's worth. All the blends are simply pouring 1 synthetic into 4 regular oils of the same viscosity of the same brand oil.
If you're in a pinch this is worth knowing. There is no special "process" used in a blend they just provide 20% synthetic.
Only the best synthetics are acid modified meaning they can neutralize all the acid produced in the recommended time/use interval. A blend is always capable of doing this with the regular oil.
The only meaningful advantage of using synthetic oil is an infinite ability to change viscosity 10-40W or other as temperature dictates. Regular oil loses this ability in a relatively short time.
Synthetic is expensive and regular oil isn't so just change it more often to keep wear under control. Unless of course you race the vehicle or run it in dusty conditions. Change is for the best sometimes.
I love all the synthetics but can't justify their use ($) under normal perfect conditions. I also drink lite beer in excess of 2 cans per day and have lived to 60....go figure. Still comes out yellow after each use.
BTW you can mix viscosities of the same manufacturer too. A trick we learned in racing...do that which achieves your desired result. We ran 1/2 10-30W and 1/2 10-40W in a high revving turbo Honda and it worked best. But changed very often too.
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