Mileage Dropped with PUP vs Mobil-1

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Originally Posted By: SilverFusion2010
Originally Posted By: JoelB
3 tenths of an mpg? You have to be kidding...


If changing viscosity effectively changes the intake valve timing I'd give this a plausible.

Otherwise....bupkus!
I'm just reporting what the DIC says. Take it or leave it. But the engine ran MUCH better with a little 5w20 mixed in. It's called viscosity tailoring , been done for decades, and it appear to be much more important with hydraulic VVT.
 
Yeah if you are changing the valve timing i can see mpg difference. I said it's plausible but there are so many variables to account for it would be difficult to pin down a pint of oil as the sole factor. If I had lots of money this is exactly the kind of problem I'd go after
 
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