Originally Posted By: 440Magnum
Originally Posted By: Durango
Guys,
OK then would I not increase mileage by going to a 5W-20 synthetic like M1 instead of using a 5W-30??? They also market a 5W-20 synthetic too.
Currently I use all the tricks I know of to save a little gas and improve mileage like checking my tires every month, make sure the air filter is clean and of course use M1 synthetic BUT in the specified 5W-30 weight. The BEST MPG I've gotten so far was 22.2 MPG on the highway.
Durango
I think Mobil does more to make the "green cap" 0w30 an energy saving oil than just the viscosity. I suspect a good dose of friction modifiers is in there also. If there's a similar friction-modified 0w or 5w20 then it might give slightly better efficiency than 0w30 AFE, but I don't think just any old 0w20 will be any more efficient than green cap 0w30. After all, its repeatedly said on here that Xw20 and Xw30 oils are usually very similar in actual viscosity, with the 20s being on the thick end of the 20 range.
By the way- my Dad would *love* to ever get 22.2 out of his Durango. Its a 5.9, and typically never exceeds 18-19. The 4.7 is buying you a *lot* of efficiency compared to the old 5.9, and probably even the old 5.2.
440Magnum,
The 5.9 liter V-8 is a gas hog for sure as told by many people from the Dakota Durango forum. Still though your dad can achieve good results if he works at it but in your region it might not be possible as I have allot of long freeway stretches to use and test MPG from my 4.7 V-8. I only achieved this when the weather permits so it must pretty perfect for me to get what I did.
Durango