Mobil 1 0w-40

Messages
1,533
Location
USA
What's the manual recommendation in USA? I believe 0w20? Any mpg hit with the thicker oil?
I also use M1 0w40 in the 2 Nissan VQ 3.5L
There will be a hit to MPG, but not enough to worry about unless you are worried about several tenths of a mpg for each grade you go up.
 
Messages
391
Location
MD
There will be a hit to MPG, but not enough to worry about unless you are worried about several tenths of a mpg for each grade you go up.
Not that I'm loosing sleep over mpg hit, but it's NOT like several tenths of a 1 mpg. I'm on my first tank with a fresh M1 0w40 and I'm already reaching half tank with like 50 miles less than the case with PUP 5w30 (very thin 5w30).
I suspect I'll end with 22mpg vs 23.5mpg plus.. (I log evey tank and mileage to a T). I'll certainly take it for a smoother idle and more engine protection. PUP also burns in my engine.
 
Messages
247
Location
Independence Ky
I’ve been using mobile 1 0w40 euro for 3 to 4 years now and love the stuff. I love older vehicles that were well maintained so drive a 1990 Toyota 4x4 22r Reg cab winter vehicle and a 1994 Ford E150 5.8l van for the summer/ vacation vehicle. I would use my van for vacation only but think it’s to hard on them sitting all of the time. The van never sees road salt but after a good hard rain to clean off the roads I’ll drive it some In the winter. The Toyota 4x4 gets treated underneath with woolwax and the stuff works. Think of all the old yotas with rusted frames. Not mine and they throw that treatment/salt down everytime we get a chance of snow or sleet. I can’t stand rust so it drives me nuts. The wife’s cars 09 Pontiac vibe AKA Toyota Matrix (for sale) and 2015 Toyota Yaris usually get a 0w20 in the winter and a 0w30 in the summer. I’ve considered just putting the 0w40 in them too.
 
Messages
1,533
Location
USA
Not that I'm loosing sleep over mpg hit, but it's NOT like several tenths of a 1 mpg. I'm on my first tank with a fresh M1 0w40 and I'm already reaching half tank with like 50 miles less than the case with PUP 5w30 (very thin 5w30).
I suspect I'll end with 22mpg vs 23.5mpg plus.. (I log evey tank and mileage to a T). I'll certainly take it for a smoother idle and more engine protection. PUP also burns in my engine.
I'm basing this on ample discussions about the mileage hit between 20 and 30 wt being almost inconsequential. There are also temperature swings, refueling errors, traffic and a host of other variables that may come into play when going for a clean comparison.

Theoretically, your estimations are very close to my estimations for MPG loss:

1.5 MPG going from a thick 20 your PU P5w30 likely was at end of its life up approximately two grades to a thin 40 would be about "several tenths per grade" right? :) There are so many variables, but I hope you get the friendly point I was making. Glad the M1 0w-40 is working out well for you, I just bought some for next OCI myself.
 
Messages
166
Several tenths MPG hit, like 1x 2.5/10 more MPG going from the 0w30 to the 0w20?

So in a vehicle that gets 30MPG hwy with a 18gal tank (manual says 0w20) = 540mi
With 0w30 you get 29.75MG hwy with 18gal tank = 535.5mi

That extra 4.5mi on a 30MPG vehicle = 0.15gal of fuel.
x say 1mil vehicles = 150,000 gal of fuel.

Across a fleet the -0.25mpg is significant amount of burned fuel.
 
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