I usually ignore some users but this is far too ludicrous to not…
Most manufactures need thinner oil to adhere to CAFÉ standards; the thinner oil must be used. This is nothing new here. Why do you think diesels are going to 5w-30 from 15w-40? Next is WHY does extended drains come into it when nothing was EVEN stated about it????
Monarch, you really have no clue on extended drains here, NONE, zero. Toyota is way behind the times here as they have been. I am not going to state the deal with Toyota since it is 100% legal issues and most people are clueless on it; some people on this very forum.Even Lexus does not state 3,000 miles. These intervals have not been in books/manuals since I have been driving!
Next is you do not even do oil testing nor even go longer with drains. The best or most laughable part is the emissions go up and mpg goes down is flat out amusing at best. Did you actually read what you copied and pasted? It does not make a statement on anything. It just states things might happen. ….I might hit the lottery too! LOL
If it was from Valvoline how come it is not on Valvoline.com? I have been doing extended drains for over 12+ years and never had emission goes up when I get them tested by the state and my MPG are constant when doing this (extended drains). So far in almost 4 years I get my car inspected by MA inspection with 11 to 12 month old oil. Gee, car passing with flying colors.
To close, next time you stick your nose into something at least have some background on it since you are way out of your league on extended drains. Go tests some car engine oils (as I have stated to you for over 3+ years) then come back and post. If you did test your oil, you would not even be posting as you did on this subject at hand.