My MPG Dropped Significantly When I Changed To Fresh Oil!!!
#1
12-31-2011, 01:26 PM
My MPG Dropped Significantly When I Changed To Fresh Oil!!!
At 120,000 miles on the Delvac 1 oil of my 2006 Volvo 780 (w/ Volvo D12 engine) and about 650,000 total miles on the engine, oil analysis suggested I finally change the oil, so I did. I discovered my MPG on flat land w/ MT trailer dropped from around 9.0 MPG to around 8.0 MPG!!!
 The good news, is that after a few thousand miles, my MPG is back up to where it should be. :smokin::smokin::smokin: 
Last edited by Aufgeblassen; 12-31-2011 at 01:47 PM. 
#4
01-01-2012, 02:46 PM
Have you had oil sample done? All I can think of is the fresh oil was thicker, as maybe the old stuff lost viscosity possibly due to fuel oil dilution. Hope not for your wallet's sake.
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#5
01-01-2012, 06:00 PM
The oil analysis said there was no fuel, water or glycol in the oil.
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#6
01-02-2012, 04:18 PM
At 120,000 miles on the Delvac 1 oil of my 2006 Volvo 780 (w/ Volvo D12 engine) and about 650,000 total miles on the engine, oil analysis suggested I finally change the oil, so I did. I discovered my MPG on flat land w/ MT trailer dropped from around 9.0 MPG to around 8.0 MPG!!!
The good news, is that after a few thousand miles, my MPG is back up to where it should be. :smokin::smokin::smokin:
#7
01-02-2012, 10:53 PM
I'm still trying to digest the fact that a truck driver can spell
[h=2]Significantly[/h]
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#8
01-03-2012, 12:27 AM
Spell Check is a wonderful tool.
I'm thinking with YerDaddy, sounds like a heavier weight oil went back in than what was spec'ed. I know my personal vehicle got crappy mileage when I ran 10W until it got about 4,000 miles in on normal everyday driving to and from work. After that the mileage jumped up about 3 mpg. Of course on long distance trips 10W actually got better mileage than the 5W got.
#9
01-07-2012, 10:58 PM
I am an engineer by degree. I launched rockets (Atlas, Titan) at Cape Canaveral Air Force Station until 05/05, when I became an O/O.
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#10
01-08-2012, 03:07 AM
I tend to believe, oil has nothing to do with it. Or at least didn't played a major role. In any case it takes more than a small viscosity difference to loose a whole 1mpg! Probably combination of factors, but since it's back to normal, i wouldn't pay much attention to it....
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