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I believe both Delo and Rotella are good oils for the money. I recently ran Delo 15W-40 CI4+ oil in a 90 V6 Ford Ranger about 6 months/10k miles and it seemed to do well and consumption was lower compared to Amsoil 10W-40 that was in it previously. I actually did not mean to run it that long but made several trips to OH and FL, so a lot of highway miles on that run. The Amsoil did ok, but certainly cost more. I will try the new CJ Rotella next after picking up several gallons for $7 each. Right now got Schaeffers 15W-40 blend in it and the consumption has dropped to an all time low of 1 quart in 5k miles!
how long did you use the Amsoil for?
depending on the condition of your engine i/e miles, oci, oil make used, you could have a seriously dirty engine and using Amsoil will clean it out, but will take time and a few quarts of oil. that may explain the decreased consumption with delo 400.
In a clean engine Amsoil will have the least amout of conpsumption of most available oil's on the shelf.
personally I had 29,000 miles on one drain with no consumption in a 2006 toyota van, 16,000 miles no consumption in a chevy tahoe 95.
on the other hand I have other vehicles that use lots of oil for a period of time, I stuck it out with Amsoil and the consumption did cease. One oil change with Amsoil wont cure 5/10 years of abuse using dino oil in your engine
Schaeffers is also an excellent choice also.