Lower Viscosity Oil & Fuel Economy

[Ramblejam]

The 3.6L discussed here is used in a wide variety of GM vehicles: https://en.wikipedia.org/wiki/GM_High_Feature_engine#LFX

Watch from 4:00 to 6:00 -

 

[Dyusik]

Increased friction from lack of fluid film strength. Duh. Friction is drag, dragging [censored] is not efficient...

 

[eljefino]

Kinda cute

like Allison Hannigan

 

[oil_film_movies]

If your engine does NOT get better MPG as you drop HTHS viscosity, then that is a sign there are some high bearing pressures (cam lobes, rings, wrist pin, rod, mains, etc.) inside which need the higher viscosity oil.

When viscosity drops too low for any engine, more metal to metal contact occurs and friction rises.

 

[Garak]

Measuring that would be an exercise in futility, though, outside an OEM or oil company lab.

 

[OneEyeJack]

Is the message here that this dexos spec'd oil is "tuned" for short term mileage and smog requirements and is somehow lacking in the robustness needed for the long run?

I tend to keep a primary daily driver much longer than most and I use a Xw-30 oil because it's my opinion that an Xw-20 might be worse, equal or better. I'm not willing to take that one chance in three that I made the wrong choice for the long run because I can't go back and do it over. This is one case where standing pat is not a mistake even if the Xw-20 dexos oil proves to be good for the long run.

 

[GenesisGuy70]

Thanks for sharing.

She is a terrible speaker tho.

 

[BrocLuno]

Meh ...

 

[aquariuscsm]

Originally Posted By: eljefino
Kinda cute

like Allison Hannigan


Haha that's EXACTLY what I was thinking!! Mmmmmm natural redhead!!